Question

find the area of the triangle whose sides are 21 CM 20 cm and 13 cm​

Answer 1

Answer:

I hope this is the right answer.

Answer 2

The area is "126 cm²". Further explanation is given below.

Step-by-step explanation:

Given sides are:

a = 21 cm

b = 20 cm

c = 13 cm

As we know,

s = $\frac{a+b+c}{2}$

On putting the values in the above formula, we get

⇒  s = $\frac{21+20+13}{2}$

⇒     = $\frac{54}{2}$

⇒     = 27 cm

Now,

Area of a triangle = $\sqrt{s(s-a)(s-b)(s-c)}$

On putting the values in the above formula, we get

⇒  Area = $\sqrt{27(27-21)(27-20)(27-13)}$

⇒           = $\sqrt{27(6)(7)(14)}$

⇒           = $\sqrt{15876}$

⇒           = 126 cm²

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