If sides of a triangle are 3,5,7 then the area of that triangle is -
Options:
A .  
√42.18
B .  
√62.78
C .  
√97.89
D .  
√23.12
Answer: Option A : A We know the area of a triangle can be calculated using its sides through Heron's formula √s(s−a)(s−b)(s−c) Where "s" is the semiperimeter of the triangle. And a, b, c are the sides of it. So, s=3+5+72=7.5 And Area = √7.5(7.5−3)(7.5−5)(7.5−7) =√42.18
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