ABCD is a parallelogram in which one angle is 120° Find the other three angles
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You need to know some of the properties of quadrilaterals:
The sum of the 4 interior angles is 360°
Adjacent angles are supplementary, meaning that they add to 180°
So if one angle = 120°, property 2 above tells us that the two angles next to it are 180° - 120° = 60°
So three of the angles are 120°, 60°, and 60°. Use property 1 above to find the last angle.
Answered by
2
You need to know some of the properties of quadrilaterals:
The sum of the 4 interior angles is 360°
Adjacent angles are supplementary, meaning that they add to 180°
So if one angle = 120°, property 2 above tells us that the two angles next to it are 180° - 120° = 60°
So three of the angles are 120°, 60°, and 60°. Use property 1 above to find the last angle.
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