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Classification of Angles Based on Degree

Find the valu...

Question

Find the value of (x+y) from the figure below:

A

120

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B

60

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C

80

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D

45

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Solution

The correct option is A
120

The value of exterior angle of a triangle is equal to the sum of the opposite interior angles.

As the exterior angle value is given to be 120 $^{\circ}$ , the sum of the two opposite interior angles is also 120 $^{\circ}$ .
Thus, (x+y) = 120 $^{\circ}$

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