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In the above figure angle a and b & angle c and d are vertical opposite angles. It is important to note that these angles are always.

That is angle a = angle b, and angle c= angle d.

=> We have to find the value of angle c and angle d.

=> For the same we know that vertical opposite angles are equal

=> Since Angle c and Angle 100 degrees are vertical opposite angles, so they must be equal.

=> Similarly Angle d and 80 degree are vertical opposite angles, so they must be equal.

=> We have to find the value of angle c and angle d

=> For the same we know that vertical opposite angles are equal

=> Since Angle c and Angle 90 degrees are vertical opposite angles, so they must be equal.

=> Similarly Angle d and 90 degree are vertical opposite angles, so they must be equal.

=> So, all angles are equal to 90 degrees.