- ASupplementary (sum 180°)
- BComplementary (sum 90°)
- CEqual
- DSum to 360°
Step-by-Step Solution
Co-interior angles between parallel sides add up to 180°, so adjacent angles of a parallelogram are supplementary.
Answer: A) Supplementary (sum 180°)
Two adjacent angles of a parallelogram are always:
Class 9Properties of a ParallelogramGeometry — Quadrilaterals
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