Question

1. Sides of a triangle
of a triangle are cm 45 cm, 39 cm and 42 cm, find its are​

Answer 1

Answer:

756 sq.cm

Explanation:

Area of triangle(Heron's formula) = √s(s-a)(s-b)(s-c)

Let's find S = 45+39+42/2

S=63

Let's substitute:

=√63(63-45)(63-39)(63-42)

=√63 × 18 × 24 × 21

=√9×7×9×2×6×4×7×3

=√9^2 × 7^2 × 2 × 6 × 4 × 3

=√9^2 × 7^2 × 144

=√9^2 × 7^2 × 12^2

=9×7×12

=756