Geometry: Angles and Lines

VivaciousElation
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18 Questions

Obtuse angle

What is the name of two lines that cross at right angles?

Perpendicular lines

Reflex angle

Protractor

Parallel lines

270°

360o

45o

12

What is the relationship between ∠AED and ∠DEB?

Vertically opposite angles

320o

360o

right angle

degrees

protractor

acute angle

reflex angle

Study Notes

Angle Classification

• An angle greater than 90o but less than 180o is an obtuse angle
• An angle greater than 180o but less than 360o is a reflex angle
• An angle of 90o is a right angle

Measuring Angles

• A protractor is used to measure angle size
• Angle size is measured in degrees (o)

Naming Angles

• An angle can be named using three letters, e.g., ∠ABC or ∠CBA
• If there is only one angle at the vertex, a single letter can be used to name the angle, e.g., ∠B
• The vertex of the angle is the point where the arms of the angle meet

Vertically Opposite Angles

• Vertically opposite angles are equal in size
• Example: ∠AED and ∠DEB are vertically opposite angles

Angle Relations

• Two lines that cross at right angles are perpendicular
• Two lines that are the same distance apart are parallel

Drawing Angles

• A protractor can be used to draw angles
• A compass can be used to draw circles
• A straight ruler can be used to draw and measure straight lines

Angle Properties

• Angles around a point add up to 360o
• Example: Kylie rotated through 360o to face the same direction as she started

Test your understanding of angles and lines with this quiz. Identify types of angles, measure angles using a protractor, and learn about different types of lines. Improve your geometry skills with these questions.

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