1. ## Math 11

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?

thanks if you helped.

2. ## Re: Math 11

Originally Posted by Montelneedshelp
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?

thanks if you helped.
hint: triangle area = (1/2)bh

3. ## Re: Math 11

Originally Posted by Montelneedshelp
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?

thanks if you helped.
Area of the roof = $A=4\cdot \frac{18 \cdot 12}{2}$

Cost of the roof = $C=5.75 \cdot A$

4. ## Re: Math 11

Did you do some work, like googling "square pyramid" ?