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#26 2012-10-30 03:44:31

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 90,672

Re: Circles: Chords, Radii, and Arcs

Yes for 7, that is what I did.

I am not following 8, where did you put C?


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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#27 2012-10-30 03:49:22

bob bundy
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Registered: 2010-06-20
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Re: Circles: Chords, Radii, and Arcs

AMC = 90

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#28 2012-10-30 03:50:20

zee-f
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Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

I put C on the circle so from m to b that is 1


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#29 2012-10-30 03:51:40

zee-f
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Re: Circles: Chords, Radii, and Arcs

ooooh but the radius of the circle is half the diameter So from M to c that is 2


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#30 2012-10-30 03:52:42

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 90,672

Re: Circles: Chords, Radii, and Arcs

Okay, I think Bob has something for you.


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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#31 2012-10-30 03:55:19

bob bundy
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Registered: 2010-06-20
Posts: 6,532

Re: Circles: Chords, Radii, and Arcs

Q8

AMC = 90  You had that in the original diagram.

AM = MC = 1 = radius

So use Pythagoras

Bob

ps.  6F, 7A, 9D all seem to be done and correct.


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#32 2012-10-30 04:01:33

zee-f
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Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

So that makes it a right triangle So that means I  can use the Pythagorean theorum.

1^2 + b^2 = 2^2
1+b^2= 4

b^2= 4-1
b^2=3
b= √3


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#33 2012-10-30 04:02:59

zee-f
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Re: Circles: Chords, Radii, and Arcs

lol sorry I posted that before reading post #31 Thank you ! big_smile


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#34 2012-10-30 04:07:51

bob bundy
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Re: Circles: Chords, Radii, and Arcs

That's OK No apology needed.  Great that you spotted this yourself.

But look again at your calculation.

Which side (AM,MC or AC) is the hypotenuse?

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#35 2012-10-30 04:28:07

zee-f
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Re: Circles: Chords, Radii, and Arcs

AC is going to be the hypotenuse


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#36 2012-10-30 04:33:03

zee-f
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Re: Circles: Chords, Radii, and Arcs

So 2^2 +2^2= c^2
     4+4= c^2
     c^2=8
   sqrt 8


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#37 2012-10-30 04:34:09

zee-f
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Re: Circles: Chords, Radii, and Arcs

#10 I like my answer (D) because I know that 9 is the length of DJ and it is equal to 3√3 *√3

So the other side is 3√3 and the hypotenuse =  3√3 *2 which gives me 6√3 which is 6*sqrt(3)


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#38 2012-10-30 04:36:49

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 90,672

Re: Circles: Chords, Radii, and Arcs

Hi;

Isn't 8) 1^2 + 1^2 = c^2?


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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#39 2012-10-30 04:48:51

zee-f
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Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

but AM is 2 and Mi is 2  so isn't AI going to be 2^2+2^2


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#40 2012-10-30 04:51:01

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 90,672

Re: Circles: Chords, Radii, and Arcs

Hi;

8. If I drew a line segment from A to C, and the radius of circle M was 1, what would line segment AC be?
A sqrt 7
B sqrt 2
C sqrt 8
D sqrt 13
E sqrt 4
F sqrt 3

Aren't they 1 not 2


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

#41 2012-10-30 04:51:02

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

if it  1^2 + 1^2 = c^2 that makes my first  answer (b) correct


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#42 2012-10-30 04:53:46

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 90,672

Re: Circles: Chords, Radii, and Arcs

From your original drawing AM is 1 and MC is 1 because they are radii. AC is the hypotenuse because it is opposite the right angle. B should be correct. Why did you change?


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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#43 2012-10-30 04:55:14

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

1 is the radius but the diameter is 2


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#44 2012-10-30 04:58:28

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 90,672

Re: Circles: Chords, Radii, and Arcs

Hi;

You do not need the diameter.


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

#45 2012-10-30 05:00:35

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

So I add the radius not the diameter to get the hypotenuse ?


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#46 2012-10-30 05:01:14

bob bundy
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Registered: 2010-06-20
Posts: 6,532

Re: Circles: Chords, Radii, and Arcs

hi zee-f

I thought you were still trying to do 8.

I've looked back, and yes you did say (b) hours ago.

Oh dear .... got in a muddle there.

As for 10, that is strange.  I cannot find the answer I've got for this.

What's your working?

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#47 2012-10-30 05:03:02

bob bundy
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Registered: 2010-06-20
Posts: 6,532

Re: Circles: Chords, Radii, and Arcs

No wait.   My mistake

D is good!

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#48 2012-10-30 05:03:06

zee-f
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Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

9 is the length of DJ and it is equal to 3√3 *√3

So the other side is 3√3 and the hypotenuse =  3√3 *2 which gives me 6√3 which is 6*sqrt(3)

I used the Special Right Triangles formula


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#49 2012-10-30 05:04:19

zee-f
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Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

When I do to much math problems I sometimes get mixed up But thanks for the help guys !


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#50 2012-10-30 05:05:35

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Circles: Chords, Radii, and Arcs

I have 10 more left but I am still working on then lol dizzy


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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