math11

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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 -

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 -

area roof= 4*1/2 * 18*12

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

• math11 -

thanks

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