Need help please Informal Geomentry 13.2 Patterns and Surface Area

Question

Imagine an Egyptian right pyramid with a square base. Suppose the sides of the square base are 80 m long and the apex of the pyramid is 80 m above ground. Determine the surface area of the pyramid (not including the base).

Answer 1

Draw and label of diagram.

By Pythagoras the height of each side (the slant height of the pyramid) is 80√2

SA = 4(0.5)(80√2)