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Anjali notices that at an X-shaped crossing, one of the four angles is 90°.
What can she conclude about the other three angles?

Class 7Adjacent and Vertically Opposite AnglesLines and Angles
  • AAll three are 90°
  • BAll three are 45°
  • CTwo are 90° and one is 180°
  • DThey cannot be determined

Step-by-Step Solution

If one angle is 90°, its linear-pair neighbour is 180° − 90° = 90°, and the vertically opposite angle is also 90°, so all four are 90°.
Answer: A) All three are 90°

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