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# In a ∆ABC, if <sp

Note: In any ΔABC we define ‘a’ as length of side opposite to A , ‘b’ as length of side opposite to B and ‘c’ as length of side opposite to C . Key point to solve the problem:

Area of ΔABC = 0.5 (product of any two sides)×( sine of angle between them)

• Idea of cosine formula: Cos A = Given Cos A = Area of ΔABC = We need to find sin A

As we know that - sin2A = 1 – cos2A {using trigonometric identity}

sin A = ar(ΔABC) = sq units. …ans

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