Answer:
The correct option is (B) 39.8 yd²
Explanation:
A rectangular pyramid consists of four triangular lateral faces and a rectangle base. The sum of the area of the rectangle base and area of the four triangular lateral faces gives the surface area of rectangular pyramid. We use the following formula
Surface Area = Base Area + Lateral Area
where
Base Area = l × b
and
Lateral Area = 1/2 ls1 + 1/2 bs2 + 1/2 ls1 + 1/2 bs2 = ls1 + bs2
So
Surface Area = Base Area + Lateral Area SA = lb + ls1 + bs2
Putting the values we get 39.9