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****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

Can I see your working for M #57, if it is not too much trouble?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi bobbym,

M # 58. The external diameter of a cylindrical shaped iron pipe is 25 centimeters and its length is 20 centimeters. If the thickness of the pipe in 1 centimeter, find the total surface area of the pipe.

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****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi bobbym,

The solution M # 58 is correct. Fantastic!

M # 59. The outer and inner radii of a hollow sphere are 12 centimeters and 10 centimeters. Find its volume.

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

**math9maniac****Member**- From: Tema
- Registered: 2015-03-30
- Posts: 419

Thanks ganesh for these questions. Can you believe my mates at school couldn't solve them even when I said they should try? I need more of these.

Solution for 59 please. I like to have the answers, solve and compare with yours. Many thanks.

Btw, any more mensuration questions?

Also I need very simple questions on trigonometry; for core math not elective. Thanks in advance.

Only a friend tells you your face is dirty.

Offline

**math9maniac****Member**- From: Tema
- Registered: 2015-03-30
- Posts: 419

Uhm...think I just saw the trig questions right on page 1 of 'ganesh puzzles'. Touch base later. Cheers.

Only a friend tells you your face is dirty.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi math9maniac and bobbym,

Marvelous, bobbym!

M # 60. The volume of a cone with a circular base is

cubi centimeters. If the base radius is 9 centimeters, then find the height of the cone.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****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**math9maniac****Member**- From: Tema
- Registered: 2015-03-30
- Posts: 419

Thanks bobbym and ganesh. Dear ganesh, I'm compiling these questions to refer to them later for revision. I hope you don't mind that, or do you? Also I'd like to know if you'd add any more so I reserve space in my book for those as well. Enjoy your day or evening (depending on where you are).

Only a friend tells you your face is dirty.

Offline

**math9maniac****Member**- From: Tema
- Registered: 2015-03-30
- Posts: 419

Hi bobbym,

I agree with your answer.

Only a friend tells you your face is dirty.

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi bobbym and math9maniac,

bobbym and math9maniac : The solution M # 60 is correct. Good work!

math9maniac : I don't mind at all! I shall add more problems whenever I find time.

M # 61. The volume of a solid hemisphere is

cubic centimeters. Find its curved surface area.Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**math9maniac****Member**- From: Tema
- Registered: 2015-03-30
- Posts: 419

Thanks ganesh. Ok, then, when you find time.

Only a friend tells you your face is dirty.

Offline

**math9maniac****Member**- From: Tema
- Registered: 2015-03-30
- Posts: 419

Hi ganesh;

Solution for M# 61 is 9504/7 cm^2.

Only a friend tells you your face is dirty.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi math9maniac and bobbym,

M # 62. Find the volume of the largest right circular cone that can be cut out of a cube whose edge is 14 centimeters?

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

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi bobbym,

The solution M # 62 is correct. Good work!

M # 63. The radius and height of a cylinder are in the ratio 5 : 7. If its volume is 4400 cubic centimeters,find the radius of the cylinder.

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

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi bobbym,

.

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

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi bobbym,

The solution M # 63 is correct. Neat work!

M # 64. The sum of the base radius and the height of a right circular cylinder is 37 centimeters. If the total surface area of the cylinder is 1628 square centimeters, then find the volume of the cylinder.

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

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 27,831

Hi bobbym,

The solution M # 64 is correct. Excellent!

M # 65. A rectangular sheet of metal foil with dimensions 66 cm x 12 cm is rolled to form a cylinder of height 12 centimeters. Find the volume of the cylinder.

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

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline