Question
If angle between two sides of 4 cm & 5 cm of a triangle
is 30°. what is the area of the triangle ?Solution
Area of the triangle = 1/2 X a X b X Sin ɵ  where ɵ is the angle between two sided a & b of the triangle; So Area of the triangle  = 1/2 X  a X  b X  Sin ɵ = 1/2 `xx` 4 `xx` 5 `xx` sin 300 = 1/2 X 4  X 5  X  1/2 = 5 cm2
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