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Is something wrong in this diagram? Comment.

3.  Is something wrong in this diagram (Fig \small 6.12)? Comment.
 

            

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Yes, The measure of the exterior angle is given wrong.

As we know that in a triangle, the exterior angle is equal to the sum of opposite interior angles.

So,

Exterior angle = 50^0+50^0

                       = 100^0

Hence the exterior angle should be equal be 100^0 instead of 50^0.

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