Find the value of y from the following figure triangle
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Let the other two angles be 'x' as this is an isosceles triangle.
- 120 deg + x = 180 deg (supplementary angle)
- x = 180 deg - 120 deg
- x = 60 deg
- x + x + y = 180 deg
- 2x + y = 180 deg
- 2(60) + y = 180 deg
- 120 deg + y = 180 deg
- y = 60 deg
Therefore, measure of angle y is 60 degree.
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