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Two lines AB and CD intersect at point O. The angle AOC measures 70°.
Using the property of vertically opposite angles, find the measure of angle BOD.

Class 9Geometrical Terms and DefinitionsGeometry — Foundations
  • A70
  • B63
  • C140
  • D77

Step-by-Step Solution

Angle AOC and angle BOD are vertically opposite, so they are equal. Hence angle BOD = 70°.
Answer: A) 70

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