1. Sides of a triangle
of a triangle are cm 45 cm, 39 cm and 42 cm, find its are
Attachments:
Answers
Answered by
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
Similar questions