First, find the area of its base. Since this is a square, the formula is l x w, so:
14 x 14 = 196 units^2
Next, the area of a triangle, which is b x h /2
So the hight is 20, base is 14, which means
14/2 * 20 = 7*20 = 140 units^2
But this is just the area for 1 triangle; there are four in this pyramid.
So 140 is multiplied by 4, which is 560 units^2.
Add the total area for the triangles to the square, and you get 196 + 560 = 756 units^s (B)
