Question

the two sides of a parallelogram area 28 cm and 20 CM if length of a diagonal is 35 cm find the area of the parallelogram​

Answer 1

Step-by-step explanation:

First we find area of ABC.

Sides are, a = 28 cm

b = 35 cm

and c = 21 cm

S = (a + b + c)/2

= (28 + 35 + 21)/2

= 84/2 = 42 cm

= 2 × 20 × 7

= 240cm2

∵ Diagonal of ∥ gm divides it into two equal parts.

∴ area of ∥ gm = 2 × area of ∆ ABC

= 2 × 240

= 480cm2

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