The length of dia

Diagonal = 15m, Length - Breadth = 3m

From Pythagorean theorem,

Length² + Breadth² = Diagonal²

As, Length = Breadth + 3

Let Length = B + 3, Breadth = B and Diagonal = 15 m

(B + 3)² + B² = 15²

2B² + 6B - 216 = 0

Or, B² + 3B - 108 = 0

B² + 12B - 9B - 108 = 0

B(B + 12) - 9(B + 12) = 0

Breadth cannot be negative, so B = 9m

Length = 12m

Perimeter = 2(L + B) = 42m

Area = L × B = 108m²