The perimeter of a triangle is 36 cm and the in radius of the triangle is 2.5 cm. What is the area of the triangle?
Pick:
A) 38 cm 2 B) 27 cm 2 C) 45 cm 2 D) 25 cm 2 E) 35 cm 2

Rationale: "area of a triangle = r * s where r is the inradius and s is the semi perimeter of the triangle . area of triangle = 2.5 * 36 / 2 = 45 cm 2 answer : c"
Answer: C