Question

The length of the diagonal of a square is 12cm find its area and perimetre from 7class

Answer 1

diagonal :12
area:4×side
4×12=48

Answer 2

area of square = ½ × (diagonal)²
= ½ × 12²
= ½ × 144cm²
=72cm²


also ar(square) = (side)²
72cm² = side²
side= √72cm²
side= 6 √2 cm


perimeter = 4 × side
perimeter = 4 × 6 √2 cm
perimeter= 24 √2 cm