Question

Find the surface area of this regular pyramid whose base is a square.

486 ft2
189 ft2
243 ft2
135 ft2

Answer 1

Area of a triangle = 1/2 b*h
Area of rectangle = l * w
And because a square has 4 congruent sides l = w so
Square = w ^2
9^2 = 81
9*6 = 54
54/2 = 27
27 * 4 triangles = 108
108 + 81 = 189 ft^2