Question

1. The length of a diagonal of a square is 7.5 mm. Find the area of the square.
2. . The length of a diagonal of a square is 5 inches. Find the perimeter of the square

Answer 1

Using pythagoras theorem a^2 can be found
a^2+a^2=d^2
2a^2=d^2
a^2=d^2/2
here
a-length of a side of the square
d-length of the diagonal
a^2-area