Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 Re: Help Me ! » Geometry review » 2013-01-07 05:08:03

yup totally agree ...... no I still need to take 1 more math course

for #8

## #3 Re: Help Me ! » Geometry review » 2012-12-19 04:57:07

I answered D it was correct that was my last lesson in geometry I got a 9/10 in that lesson and still waiting for my final course grade thank you guys!!! ur always the best in helping

## #4 Re: Help Me ! » Geometry review » 2012-12-19 03:55:03

I know how annoying I said it was D because B was incorrect if thats incorrect to then I give up

## #5 Re: Help Me ! » Geometry review » 2012-12-19 01:30:57

yup A was correct but I got 2 incorrect #6, #8

6. Calculate the area of the regular octagon shown.
6.B
I choose B because area = (½)(apothem)(perimeter)
1/2 * 3.8 * 48 = 91.2

8.I still think it is B I cant really find what I did incorrect for this one I really need a clue.
I used the Pythagoras to get the missing side I got  2.38 Then I used cosine= A/H 9/11 = 0.82
cos-¹ = 34.92 So that is angle A

90+34.92=124.92

So angle B = 180 - 124.92 = 55.08
A= 34.92
B= 55.08
C= 90

## #6 Re: Help Me ! » Geometry review » 2012-12-19 00:27:38

So its really asking for that triangle area
2*PI*6*16=192PI
or 603.19
So A can be the answer

## #7 Re: Help Me ! » Geometry review » 2012-12-18 12:21:05

I still get B

2×(36×pi)+603.2 = 829.39

36pi is the circle area
then the area of the triangle is=  12pi( circumference of the circle ) * (16) = 192PI or 603.2

SA = 2×(36×pi)+603.2 = 829.39

## #8 Re: Help Me ! » Geometry review » 2012-12-18 08:07:29

I choose B and it was incorrect still cant find the answer

16. A right circular cylinder has a base diameter of 12 meters and a height of 16 meters. What is the approximate total lateral surface area of the cylinder?

A 602.9 m²
B 829.4 m²
C 1507.2 m²
D 2034.7 m²

## #9 Re: Help Me ! » Geometry review » 2012-12-18 07:42:48

So what I did isn't incorrect right? but I answered B and it was incorrect

## #10 Re: Help Me ! » Geometry review » 2012-12-18 06:08:18

8. Select which statement is true about the relationship between the measures of angle A and angle B in the diagram shown.

A The measure of angle A is greater than the measure of angle B   .
B The measure of angle B  is greater than the measure of angle A.
C The measure of angle A  is equal to the measure of angle B   .
D Cannot be determined without any other calculations.

#8- Ok so I first choose B but I still see that my answer is correct

because the measure of the missing angle would 2.38
Then I use cosine= A/H
9/11 = 0.82
cos-¹ = 34.92

So that is angle A
90+34.92=124.92
So angle B = 180 - 124.92 = 55.08

A= 34.92
B= 55.08
C= 90

## #11 Re: Help Me ! » Geometry review » 2012-12-18 05:43:28

I thought you meant reverse the  statements

## #12 Re: Help Me ! » Geometry review » 2012-12-18 02:26:46

So A would be correct?

## #13 Re: Help Me ! » Geometry review » 2012-12-17 22:55:28

I need help solving this I choose D and it was incorrect

11. Which is the contrapositive of the following statement? If quadrilateral ABCD is a rectangle, then quadrilateral ABCD is a square.

A If quadrilateral ABCD is a square, then quadrilateral ABCD is a rectangle.
B If quadrilateral ABCD is not a square, then quadrilateral ABCD is not a rectangle.
C If quadrilateral ABCD is not a rectangle, then quadrilateral ABCD is not a square.
D If quadrilateral ABCD is not a square, then quadrilateral ABCD is a rectangle.

## #14 Re: Help Me ! » Geometry review » 2012-12-17 22:52:24

Ok first I choose B

My correction is :
area = (½)(apothem)(perimeter)

1/2 * 3.8 * 48 = 91.2

6. Calculate the area of the regular octagon shown.

A 21.9 square meters
B48.0 square meters
C91.2 square meters
D350.4 square meters

## #15 Re: Help Me ! » Geometry review » 2012-12-17 10:19:19

I choose A and it was incorrect still confused

Ok so Obtuse Triangle has an angle that is  more than 90°  So that means only one angle is more than 90° and an isosceles triangle  has  two equal sides and two equal angles. So am thinking the last picture

5. Which triangle is an obtuse isosceles triangle?

## #16 Re: Help Me ! » Geometry review » 2012-12-17 06:48:34

Yeah I sure did I drew it on my note book then found out how easy the question was I sure will try it next time

I corrected the following :
I choose D and it was incorrect
now I choose C

FG=BC

So A= x
b = 180 - x

So D is X F= 180-x

So the angles are supplementary because they add up to 180
4. Which statement about angle 1 and 2 must be true?

A  angle 1 is congruent to angle 2
B- 1 is the complement of  angle 2
C- angle 1 is the supplement of angle 2
D- Angle 1 and 2  are vertical angles

## #17 Re: Help Me ! » Geometry review » 2012-12-17 04:13:05

If I say the distance from B to c is 2
then AB would be 10-2=8

## #18 Re: Help Me ! » Geometry review » 2012-12-17 04:10:16

DE = 5 and I know that DE is half of CE So CE would equal CD*2 So CE=10

DE=5
CD=5
CE= 10
AC= 10
So AE= 20

## #19 Re: Help Me ! » Geometry review » 2012-12-17 01:59:02

I choose D because I didn't read the question correctly ammm but can I use the distance formula to get the answer ?

3. In the figure shown, line segment AC = CE  , D is the midpoint of  CE   , DE=5, and BC=2 . What is the measure of AB   ?

A 5
B7
C8
D10

yeah its a typo

## #21 Re: Help Me ! » Geometry review » 2012-12-16 10:20:23

yup I mean x
So x is the large than the small angle is x-35

So x+x-35=90

x+x= 2x

-35+2x=90
-(-35)      -(-35)

2x=125

x = 62.5

So the measure of the larger angle is 62.5

## #22 Re: Help Me ! » Geometry review » 2012-12-16 08:43:04

So the equation would be x + y - 35 = 90 right?

## #23 Re: Help Me ! » Geometry review » 2012-12-16 05:45:17

I choose B because Complementary angles are two angles whose measures total 90 degrees.

90 - 35 = 55 and it was incorrect.

1. Two angles are complementary. The smaller angle is 35°   less than the larger angle. What is the measure of the larger angle?

A- 27.5°
B- 55°
C- 62.2°
D- 125°

## #24 Re: Help Me ! » Geometry review » 2012-12-16 05:21:52

I submitted my work I got 12/20 So 8 wrong

Thank you