Question

find the area of a triangle whose sides are 9 cm,12cm,15cm​

Answer 1

Answer:

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

Step-by-step explanation:

Here, a = 9cm, b = 12cm , c = 15cm

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Answer 2

Answer:

54 sq cm.

Step-by-step explanation:

Using Heron's formula for finding area when three sides of given.

A = √s(s-a)(s-b)(x-c)  where s = a + b + c/2

a = 9, b = 12

cm , c = 15 cm.

s= a+b+c/2 = 36/2 = 18.

A = √18 (18 - 9)(18 -12)(18 - 15)

    = √18 * 9 * 6 * 3

    = √2916

    = 54 sq m