The perimeter of a triangle is 20 cm and the inradius of the triangle is 2.5 cm. What is the area of the triangle? Choose the correct choice from the following options
A) 28 cm 2
B) 27 cm 2
C) 29 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 * 20 / 2 = 25 cm 2 answer : d"
Answer: D