Questions and Answers
What is the measure of an angle that is greater than 90° but less than 180°?
Obtuse angle
What is the name of two lines that cross at right angles?
Perpendicular lines
What is the measure of an angle that is greater than 180° but less than 360°?
Reflex angle
What tool is used to measure ∠ABC?
Signup and view all the answers
What are two lines that are the same distance apart called?
Signup and view all the answers
What is the value of the reflex angle ∠EFG?
Signup and view all the answers
What is the total of the angles around a point?
Signup and view all the answers
What is the angle size between each spoke if a bicycle wheel has 8 spokes?
Signup and view all the answers
If a wheel has an angle of 30o between each spoke, how many spokes does it have?
Signup and view all the answers
What is the relationship between ∠AED and ∠DEB?
Signup and view all the answers
If Kylie rotates 120o, 88o, 112o, and then stops, how many degrees has she rotated in total?
Signup and view all the answers
What is the sum of the angles in the diagram a + b + c?
Signup and view all the answers
What is the name of an angle that is 90o or a ¼ turn?
Signup and view all the answers
What is the measure of an angle called?
Signup and view all the answers
What is used to measure the size of an angle?
Signup and view all the answers
What is the name of an angle that is greater than 0o but less than 90o?
Signup and view all the answers
What is the name of an angle that is greater than 180o but less than 360o?
Signup and view all the answers
What is the symbol used to represent an angle?
Signup and view all the answers
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
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
