Geometry of Straight Lines & 2D Shapes is one of 9 topics in the Grade 8 Mathematics CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What size is a right angle, formed by two perpendicular lines?
Answer: 90 — Perpendicular lines meet at exactly 90 degrees.
Easy
2. When two straight lines intersect, what is true of vertically opposite angles?
They are always equal
They always add up to 90°
They are always different
They always add up to 360°
Answer: They are always equal — Vertically opposite angles (directly across from each other at the crossing point) are always equal.
Medium
3. Two angles lie on a straight line. One is 115°. What is the other?
Answer: 65 — Angles on a straight line add up to 180°: 180-115=65°.
