Question

In the figure the measure of angle ABC is:​

Answer 1

Answer:

Answer is in the attachment

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A

Answer 2

Answer:

∠BAC = 20° [VERTICALLY OPPOSITE ANGLES]

We know that the exterior angle of a triangle equals the sum of the other two opposite angles present inside the triangle.

This means that with respect to the given figure,

∠ABC + ∠BAC = 120°

We have already found out the value of ∠BAC, i.e., 20°.

Substituting the value of ∠BAC in the above equation,

120° = ∠ABC + 20°

∴∠ABC = 120° - 20°

  ∠ABC = 100°