Calculate the surface area of the square pyramid that has a base length of 12 and a slant height of 18. Show your work.(2 points)
make it look like a 7th grader did it
Surface area of a square pyramid = base area + (0.5 × perimeter of base × slant height)
Base area = side length × side length = 12 × 12 = 144
Perimeter of base = 4 × side length = 4 × 12 = 48
Surface area = 144 + (0.5 × 48 × 18)
= 144 + (0.5 × 864)
= 144 + 432
= 576
The surface area of the square pyramid is 576 square units.