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Question

If in a Δ ABC, perimeter is 12 units, b = 3 units, c = 5 units then find sin(A2).

A
15
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B
5
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C
13
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D
3
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Solution

The correct option is A 15
We know, sin(A2)=(sb)(sc)b.c
Where"s" is the semiperimeter and b & c are the sides of a triangle.
We'll do the appropriate substitution -
sin(A2)=(63)(65)3.5
sin(A2)=15

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