Principle of Mathematical Induction

Principle of Mathematical Induction


The area of a triangle is 75 square cm. If sides AB = 20 cm, AC = 15 cm, find ∠A.


Using formula,
      space space space Area space of space ΔABC space equals space 1 half bcsinA comma, we have
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rightwards double arrow                space space space sinA space equals space fraction numerator 75 cross times 2 over denominator 20 cross times 15 end fraction equals 1 half
rightwards double arrow                   angle straight A space equals space 30 degree space or space 150 degree

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