Answer : 137.25
Step 1 - Convert the base of a triangle to decimal form
15 1/4 = 15.25
Step 2 - Multiply base by height
18 * 15.25 = 274.5
Step 3 - Divide 274.5 by 2
274.5 ÷ 2 = 137.25
A triangular pyramid has 4 triangular faces. If all 4 have the same area, then one of them has area 1/4 of the surface area, 1836. That gives 459 sq ft as the area of one of the triangular faces.
