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 Three sides of a triangle are 6cm, 12cm, and 13 cm. Then

A. All the three angles are acute.              B. The triangles is right angled triangle.                 C. One angle is obtuse and others acute.              D. One angle is obtuse, one right angle and one acute.

A.

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Answer :A

All three angles are Acute. you can find it using cosine rule 

Cos A = (b2+c2-a2)/2bc

were a,b,c are the sides of the triangle. 

Angles are A = 27.39°, B = 85°, C = 66°

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hi

i dont . bye

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first of all , this kind of a triangle does not exist , well for your answer the option a is correct

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