- A110
- B90
- C100
- D200
Step-by-Step Solution
Adjacent angles supplementary: 4k + 5k = 180, 9k = 180, k = 20. Angle B = 5k = 100°.
Answer: C) 100
In parallelogram ABCD, angle A and angle B are in the ratio 4 : 5.
Use the property of adjacent angles to find angle B (in degrees).
Class 9Conditions for a ParallelogramGeometry — Quadrilaterals
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