Sunday

February 1, 2015

February 1, 2015

Posted by **Reshma** on Monday, May 23, 2011 at 5:31am.

2)A pyramid has a square base of side 12cm and a height of 15cm .Calculate its volume and total surface area?

- Math -
**Damon**, Monday, May 23, 2011 at 5:41amV = 40 (4/3) pi r^3

r = 1

V = (160/3) pi

V = (1/3)pi r^2 h

(160/3) pi = (1/3) pi 3^2 h

160 = 9 h

h = 160/9

2)

(1/3) 144 (15) = V

distance up slope of side :

15^2 + 6^2 = L^2

L = sqrt (225+36) = sqrt(261)

area of one side = (1/2)(12)sqrt 261

area of 4 sides = 24 sqrt 261

It is not clear if we should add the bottom area

If so then 144+24 sqrt 261

**Answer this Question**

**Related Questions**

maths-surface area - A solid is in the form of cone mounted on a hemisphere in ...

maths - a solid sphere of radius r is melted and cast into the shape of a solid ...

Math - A sphere is inscribed in a right cone. The slant height of the cone = the...

AP Calculus..again - A balloon is composed of a right circular cone joined at ...

Math - A cone and a square based pyramid have slant heights of 6 inches . The ...

maths - Im confused can any1 help me on this question ?? or try and put me on ...

Math - Please Help - A right circular cone has a volume of 140 in^3. The height ...

Calculus 2 - I am having so many problems with these volume problems, 1. Find ...

geometry - Cone a is 9 inches tall and has a diameter of 8 inches. Cone b has a ...

8th grade math - A cylinder has a cone on top. The base of the cone is congruent...