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A parallelogram ABCD is constructed with AB = 7 cm, BC = 5 cm and angle B = 60°.
Using the property of co-interior angles between parallel sides, what is the measure of angle A?

Class 8Constructing QuadrilateralsGeometry
  • A120
  • B110
  • C240
  • D130

Step-by-Step Solution

In a parallelogram, adjacent angles are supplementary. So angle A = 180 - angle B = 180 - 60 = 120°.
Answer: A) 120

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