Answer:
A = 32 ft²
Explanation:
the area (A ) of a square is calculated as
A = s² ( s is the side length )
the diagonal divides the square into 2 right triangles
using Pythagoras' identity on the lower right triangle with hypotenuse 8 and sides s , then
s² + s² = 8²
2s² = 64 ( divide both sides by 2 )
s² = 32
Then
A = s² = 32 ft²