What is the surface area of a regular square pyramid with a slant height of 12 cm and a lateral edge of 13 cm?
A) 100 cm squared
B) 240 cm squared
C) 340 cm squared
D) 640 cm squared
Each side will be a triangle with a height of 12 and a base edge of 10
So,,,,,the sides will be 4 triangles with an area of 4*(1/2)(12)(10) = 240cm^2
And the base area is 10^2 = 100cm^2
So...the total surface area is 240 + 100 = 340 cm^2
9
+252 
