Question

If the sides of triangle 9cm ,12cm, and 15 cm. Find the area of the triangle.

Answer 1

We know that area of a triangle = √s (s-a)(s-b)(s-c), where s= (a + b +c) /2

ATQ, 

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

⇒ s= ( 9+ 12 + 15)/ 2
⇒ s= 36/2
⇒ s= 18

Put s= 18 in the Heron's formula and we get:

Area= √ 18 * ( 18-9)(18-12)(18-15)
⇒ √ 18 * 9 * 6 * 3
⇒ √2916
⇒ 54

So Area of Δ = 54cm²

Answer 2

Step-by-step explanation:

see the attached image above

hope this will help you

thanks for ASKING questions to us

have a nice day AHEAD

✌✌✌✌✌✌