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Sahay Sir > Question Answers > NCERT Class 9 > Maths > Chapter 12 - Heron's Formula > If a, b, c are the lengths of three sides of a triangle, then area of a triangle = root s(s – a) (s – b) (s – c) , where s = perimeter of triangle.

If a, b, c are the lengths of three sides of a triangle, then area of a triangle = root s(s – a) (s – b) (s – c) , where s = perimeter of triangle.

B c are the lengths of three sides of a triangle If A then area of a triangle = root s(s - a) (s - b) (s - c) where s = perimeter of triangle.