Posted by **Just a question** on Wednesday, February 29, 2012 at 10:46pm.

The roof of a building is shaped like a square pyramid, with a base of 18m by 18m. If the slant height of the roof is 12m and roofing costs 5.75m2, how much will it cost for roofing material?

if the pyramid has 4 sides does each side have 18m?

- math11 -
**Damon**, Wednesday, February 29, 2012 at 10:53pm
You have four triangles of base 18 and altitude 12

area = 4 * (1/2) * 18 * 12

multiply area by 5.75 to get cost

- math11 -
**bobpursley**, Wednesday, February 29, 2012 at 10:54pm
area roof= 4*1/2 * 18*12

cost= area * $5.72 That is pretty cheap roofing, about 50cents/square foot.

- math11 -
**Just a question**, Thursday, March 1, 2012 at 2:48am
thanks

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