Question

A regular square pyramid has base edge 5 and height 9. A similar pyramid has height 12. Find the ratio of the lateral areas.

Answer 1

so.. know the formula--> A = (1/2)bs
s2/s1 = 12/9 = 4/3
b2/b1 = 4/3
A2/A1 = 16/9.....hope it helps a bit.

Answer 2

Just try to remember this
regular square pyramid' has an easy formula:
LatArea = (1/2) * (Perimeter of Base) * (slant height)