The perimeter of a triangle is 42 cm and the inradius of the triangle is 5.0 cm. What is the area of the triangle?	Answers:
A) 128 cm2	B) 36.0 cm2	C) 105 cm2	D) 25 cm2	E) 135 cm2
Area of a triangle = r * s   Where r is the inradius and s is the semi perimeter of the triangle.   Area of triangle = 5.0 * 42/2= 
<gadget id="calculator">5.0 * 42/2</gadget>
<output>105</output>
105 cm2   Answer: 105 cm2
<result>C</result>
The perimeter of a triangle is 42 cm and the inradius of the triangle is 5.0 cm. What is the area of the triangle?