Q. 30

# Find the area of

Let the sides of the triangle ABC be:

a = 40 cm, b = 80 cm and c = 60 cm

s = = = = 90 cm

Now, by using Heron’s formula we get:

Area of = = = = 30 × 10 = 300 × 3.87

= 1161 cm2

As we know that, the diagonal of a parallelogram divides it into two triangles of equal areas

Area of parallelogram (ABCD) = 2 × Area of ( )

= 2 × 1161

= 2322 cm2

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