Year 7 · Maths · Lines and angles · Lesson 1
Types of angle and measuring angles
Name types of angle, and measure and draw angles accurately using a protractor.
24-minute video lesson
Teaching, worked examples and 20 practice questions solved step by step.
Watch free for a monthWhat your child will learn
- Know that angles are measured in degrees
- Name acute, right, obtuse and reflex angles
- Measure angles with a protractor
- Draw angles with a protractor
- Estimate angles
The method
- Estimate first: acute, obtuse or reflex?
- Centre of the protractor on the corner, zero line on one arm.
- Count up from 0 on the correct scale.
- Check the reading matches your estimate.
Key words: angle, degree, protractor, acute, obtuse, reflex.
Worked examples
The first three practice questions from the lesson, with every step.
Question 1
What type of angle is this?
- Step 1: Compare with a right angle
- Step 2: Less than 90°
- Step 3: Acute
Answer: Acute
Question 2
What type of angle is this?
- Step 1: Compare with a right angle
- Step 2: Between 90° and 180°
- Step 3: Obtuse
Answer: Obtuse
Question 3
What type of angle is this?
- Step 1: Compare with a right angle
- Step 2: Less than 90°
- Step 3: Acute
Answer: Acute