# Geometry Basics: Lines and Angles

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## 5 Questions

Parallel lines

Straight angle

Right angle

### Which pair of angles combine to form a right angle?

Complementary angles

Acute angle

## Study Notes

• Lines that are in the same direction and will never cross are called 'parallel lines'.
• When lines cross at a point, it's called an 'intersection', and angles are formed.
• Angles can be named using the points that form them, and arcs can represent angles between intersecting lines.
• Perpendicular lines form right angles, which are indicated by a special square symbol.
• An acute angle is smaller than a right angle, while an obtuse angle is larger.
• A straight angle is formed by two rays pointing in opposite directions, creating a straight line.
• Complementary angles combine to form a right angle, while supplementary angles combine to form a straight angle.

Test your knowledge on fundamental concepts in geometry such as parallel lines, intersections, angles, and angle measurements. Learn about perpendicular lines, acute angles, obtuse angles, and more.

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