# 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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