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Two lines intersect at O. If one of the angles formed is a right angle, what can be said about the other three angles?

Class 9Pairs of AnglesGeometry — Lines and Angles
  • AAll three are right angles
  • BTwo are 90° and one is 180°
  • CThey are all acute
  • DThey are all obtuse

Step-by-Step Solution

Its linear-pair partner is 180 - 90 = 90°, and the vertically opposite angle equals 90°; so all four angles are 90°.
Answer: A) All three are right angles

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