Solve.If the three lengths of the sides of a triangle are known, Heron's formula can be used to find its area. If a, b, and c are the three lengths of the sides, Heron's formula for area is: A = 
where s is half the perimeter of the triangle, or s = 
(a + b + c).Use this formula to find the area of the triangle if a = 9 cm, b = 11 cm and c = 16 cm. 
A. 3
sq. cm
B. 18
sq. cm
C. 180
sq. cm
D. 18
sq. cm
Answer: D
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