The area of triangle with sides 3 cm, 5cm, 6cm is

A 28 cm²

B 2√14cm²

C 3√14cm²

D √14cm²

Solution

Correct Answer: Option B

অর্ধ -পরিসীমা S=(3+5+6)/2
                          =14/2=7
অতএব ,
ত্রিভুজটির ক্ষেত্রফল =√(s(s-a)(s-b)(s-c)
                          =√7(7-3)(7-5)(7-6)
                          =√7.4.2.1
                          =2√14

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