Perimeter = 2(L + B) = 34cmArea = LB = 60sqcmSo L + B = 34, squaring on both sides(L + B)2 = 1156L2 + B2 + 2LB = 1156LB = 60L2 + B2 + 120 = 1156Or L2 + B2 = 1036We know that Diagonal2 = L2 + B2So D2 = 1036D = 32.18cm

Q. 20 E

The perimet

Class 9th West Bengal Mathematics 15. Area and Perimeter of Triangle and Quadrilateral Shaped Region

Answer :

Perimeter = 2(L + B) = 34cm

Area = LB = 60sqcm

So L + B = 34, squaring on both sides

(L + B)² = 1156

L² + B² + 2LB = 1156

LB = 60

L² + B² + 120 = 1156

Or L² + B² = 1036

We know that Diagonal² = L² + B²

So D² = 1036

D = 32.18cm

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