ABCD is a parallelogram. If angle A is equal to 45°, then find the measure of its adjacent angle.
Answer & explanation
Correct answer: option 1
Properties of parallelogram:
- Opposite angles are equal
- Adjacent angles are supplementary
- The sum of interior angles of a parallelogram is equal to 360°
- The consecutive angles of a parallelogram should be supplementary
As adjacent angles are supplementary thus, the measure would be 180° - 45° = 135°.