Grade 9 Angle Proofs Worksheet
This worksheet focuses on proving angle relationships using geometric theorems and postulates, suitable for Grade 9 math students.
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Grade 9 Angle Proofs Worksheet
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Read each question carefully and provide clear, logical proofs for the angle relationships.
1. Given that lines AB and CD intersect at point E, and ∠AEC = 40°. Prove that ∠BED = 40°.
2. If two parallel lines are intersected by a transversal, then alternate interior angles are .
3. The sum of the angles in a triangle is always degrees.
4. Vertical angles are always complementary.
True
False
5. If two angles are supplementary, their sum is 90°.
True
False
6. Given: Line L is parallel to Line M. Prove: Corresponding angles are congruent.
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