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

You are not logged in.

- Topics: Active | Unanswered

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solutions #5223 and #5224 are correct. Magnificent, bobbym!

(Use

)#5225. A circular ground whose diameter is 35 meters, has a 1.4 meter broad garden around it. What is the area of the garden in square meters?

#5226. A circular garden has a circumference of 440 meters. There is a 7 meter wide border inside the garden along its periphery. Find the area of the border in square meters.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solutions #5225 (roughly) and #5226 are correct. Marvelous, bobbym!

The solution #5225 I get is

#5227. The areas of two concentric circles forming a ring are 154 square centimeters and 616 square centimeters. Find the breadth of the ring.

#5228. A circular park has a path of uniform width around it. The difference between outer and inner circumferences of the circular path is 132 meters. Find its width.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

Did you want to use π = 22 / 7? I used π = 3.14159.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solutions #5227 and #5228 are correct. Remarkable, bobbym!

#5229. A circular swimming pool is surrounded by a concrete wall 4 feet wide. If the area of the concrete wall surrounding the pool is 11/25 that of the pool, find the radius of the pool.

#5230. The ratio of the outer and the inner perimeters of a circular path is 23:22. If the path is 5 meters wide, find the diameter of the inner circle.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

#5231. What will be the area of a semi-circle of a diameter 14 meters?

#5232. A semi-circle shaped window has diameter of 63 centimeters. What is its perimeter equal to?

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solutions #5229 and #5230 are perfect. Excellent, bobbym!

(Use

)#5233. What will be the area of a semi-circle whose perimeter is 36 centimeters?

#5234. Find the area of a sector of a circle of radius 5 centimeters, formed by an arc of length 3.5 centimeters.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

#5235. Find the midpoint of the line segment joining the points (1, -1) and (-5, 3).

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solution #5235 is correct. Good work!

#5236. Find the midpoint of the line segment joining the points (0,0) and (0,4).

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solution #5236 is correct. Neat job!

#5237. Find the centroid of the triangle whose vertices are (1,3), (2,7) and (12,-16).

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solution #5237 is perfect. Neat work!

#5238. Find the centroid of the triangle whose vertices are (3, -5), (-7, 4) and (10, -2).

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solution #5238 is perfect. Neat job!

#5239. The center of a circle is at (-6,4). If one end of a diameter of the circle is at the origin, find the other end.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solution #5239 is perfect. Neat job!

#5240. If the centroid of a triangle is at (1,3) and two of its vertices are (-7,6) and (8,5), then find the third vertex of the triangle.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solution #5240 is correct. Neat job!

#5241. Find the coordinates of the point which divides the line segment joining (3,4) and (-6,2) in the ratio 3:2 externally.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,183

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,895

Hi bobbym,

The solution #5241 is correct. Neat job!

#5242. Find the area of the triangle formed by the points (0,0), (3,0) and (0,2).

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

Hi ganesh

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

Offline