If the sides of a triangle are 21 cm, 19 cm and 5 cm, what is its area?  Choose the correct choice.
A) 42.25 cm 2	B) 57.5 cm 2	C) 42.5 cm 2	D) 47.5 cm 2	E) 52.5 cm 2

Rationale: "the triangle with sides 21 cm , 19 cm and 5 cm is right angled , where the hypotenuse is 21 cm . area of the triangle = 1 / 2 * 19 * 5 = 47.5 cm 2 answer : d"
Answer: D