The roof on a shed is a square-based pyramid. if the base has a side length of 10 feet and the slant length of the root is 9.4 feet, find the area of the roof.

We know that 

[the area of the root]=4*[area of one lateral triangle side]

area of one lateral triangle side=b*h/2
b=10 ft
h=9.4 ft
area of one lateral triangle side=10*9.4/2> 47 ft²

[the area of the root]=4*[47]> 188 ft²

the answer is
the area of the root is 188 ft²