Question

if the perimeter of a square is (4y+12)m, then the length of its diagonal is ?

Answer 1

perimeter =4(side)
4y+12=4(side)
side of square =y+3
diagonal=sqrt2(side)
=sqrt2(y+3)

Answer 2

let the sides of square be a
4a = (4y+12)m
4a = 4(y+3)m
a=(y+3)m

diagonal of square = ✓2a=✓2(y+3)m

Hope it helps...