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At a road crossing in Pune, two straight lanes intersect. One of the four angles is a right angle.
What can you conclude about all four angles?

Class 7Pairs of AnglesLines and Angles
  • AAll four angles are 90°
  • BTwo are 90° and two are 45°
  • COnly the opposite angle is 90°
  • DThe angles are 90, 90, 45, 45

Step-by-Step Solution

If one angle is 90°, its linear-pair angle is 180 - 90 = 90°, and the vertically opposite angles equal these. So all four angles are 90°.
Answer: A) All four angles are 90°

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