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Question

In a ΔABC,ifC=30,a=47cm and b=94cm, then the triangle is


  1. Right angled

  2. Obtuse angled

  3. Right angled isosceles

  4. Isosceles


Solution

The correct option is B

Obtuse angled


cosC=a2+b2c22ab
32=(47)2+(94)2c22×47×94c=58.24
B=124. Hence obtuse angled triangle.

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