Question

how do you find the lateral area of the square pyramid in the pic below?

Answer 1

You have 1 square base and 4 identical triangular sides.
Lateral surface area (lateral meaning side) involves only the 4 triangular sides.
And since they are identical, just find the area of one triangle and multiply it by 4.

Answer 2

what is the formula @ranga

Answer 3

Area of a triangle = 1/2 * base * height.

Answer 4

Since there are 4 triangles, you will have to multiply by 4 to find the lateral surface area.
LSA = 4 * 1/2 * base * height = 2 * base * height.

From the diagram, base of triangle = 8m; height of triangle = 22m.
plug in the numbers. Answer will have the units m^2.