Sides of a triangle are 13 cm.14cm.and 15cm.respectively.calculate the area of triangle. Pick one
A) 80
B) 82
C) 84
D) 86
E) 88

Rationale: let a = 13 cm , b = 14 cm . and c = 15 cm . s = 1 / 2 ( 13 + 14 + 15 ) = 21 , ( s - a ) = 8 , ( s - b ) = 7 and ( s - c ) = 6 area = √ 21 * 8 * 7 * 6 = 84 sq . cm answer c
Answer: C