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April 23, 2014

April 23, 2014

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

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