Question

find the perimeter of the square if its diagonal is 10 root 2 cm​

Answer 1

by patha goras theorem if side of square is a

10√2*10√2=a*a+a*a

200=2a*a

100=a*a

a=10cm

perimeter=4*a

=4*10=40cm

Answer 2

diagonal of square = √2×side of square

10√2 =√2 × side of square

side of square = 10 cm

perimeter of square =4*side

=40 cm