If the lengths of three sides of a triangle are known, then the following formula, known as Hero's (or Heron's) formula is sometimes used:
? 
?wherea,b, andcare the given lengths of the sides, and 
. Use this formula to find the area of a triangle with the lengths given below (correct to the nearest square foot).
? 
ft, 
ft, and 
ft
?
A. 41 ft2
B. 3 ft2
C. 6 ft2
D. 13 ft2
E. 14 ft2
Answer: C
Mathematics
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