A triangle’s two angle’s are 45° and 60°. What is the value of its third angle?

A) 75°

B) 50°

C) 90°

D) None of these

We know the:

Sum of angles of a triangle is equal to 180

⇒ A+B+C= 180°

    45°+60°+C=180

         105+ C =180

                   C= 180-105

                   C=75°

 

 

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  2. In a triangle with sides a=60, b=40 c=38, the largest angle of measure is the angle opposite to the side?
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  4. What is the sum of all the four angles of a rectangular?