Q1
If two lines intersect, then vertically opposite angles are:
📝 SolutionVertically opposite angles formed by two intersecting lines are always equal.
Q2
Two angles are complementary if their sum is:
📝 SolutionComplementary angles: sum = 90°. Supplementary angles: sum = 180°. Adjacent angles on a line are supplementary.
Q3
If a transversal intersects two parallel lines, corresponding angles are:
📝 SolutionWhen a transversal cuts two parallel lines: corresponding angles are equal, alternate interior angles are equal, co-interior angles are supplementary.
Q4
The sum of angles in a triangle is:
📝 SolutionAngle sum property: sum of all three angles in any triangle = 180°.
Q5
An exterior angle of a triangle equals:
📝 SolutionExterior angle theorem: an exterior angle of a triangle = sum of the two non-adjacent (remote) interior angles.
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Class 9 · Maths
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