Question

If the perimeter of a triangle is 28 cm and its inradius is 3.5 cm, what is its area?

• A. $35$cm^2$$
• B. $42$cm^2$$
• C. $49$cm^2$$
• D. $28$cm^2$$

Answer 1

Answer:

$49$cm^2$$

Semi-perimeter of the triangle (s) = $\frac{28}{2} = 14$

As we know,

Area of triangle = $Inradius\times{S}$ = $3.5\times{14}$ = 49 cm²