Free Grade 3 Introducing Angle Bisector Techniques Quizzes
Free Grade 3 quizzes for Introducing Angle Bisector Techniques: 12 real questions with a full answer key and worked solutions. Angles on a straight line add to 180°, around a point to 360°, and inside a triangle to 180°. A polygon with n sides has interior angles adding to (n − 2) × 180°.
Free
Foundation
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain introducing angle bisector techniques
Explain introducing angle bisector techniques accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing angle bisector techniques
Calculate introducing angle bisector techniques accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing angle bisector techniques
Compare introducing angle bisector techniques accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify introducing angle bisector techniques
Justify introducing angle bisector techniques accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Introducing Angle Bisector Techniques works
Angles on a straight line add to 180°, around a point to 360°, and inside a triangle to 180°. A polygon with n sides has interior angles adding to (n − 2) × 180°.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Two angles on a straight line. One is 40°. Find the other.[1]
- 2.Two angles on a straight line. One is 112°. Find the other.[1]
- 3.Two angles on a straight line. One is 37°. Find the other.[1]
- 4.Two angles on a straight line. One is 47°. Find the other.[1]
- 5.A triangle has angles 87° and 62°. Find the third angle.[2]
- 6.A triangle has angles 89° and 33°. Find the third angle.[2]
- 7.A triangle has angles 76° and 50°. Find the third angle.[2]
- 8.A triangle has angles 40° and 27°. Find the third angle.[2]
- 9.Find the size of each interior angle of a regular 8-sided polygon.[3]
- 10.Find the size of each interior angle of a regular 6-sided polygon.[3]
- 11.Find the size of each interior angle of a regular 10-sided polygon.[3]
- 12.Find the size of each interior angle of a regular 5-sided polygon.[3]
Show answers and working
1. 140°
Angles on a straight line add to 180°. 180 − 40 = 140°.
2. 68°
Angles on a straight line add to 180°. 180 − 112 = 68°.
3. 143°
Angles on a straight line add to 180°. 180 − 37 = 143°.
4. 133°
Angles on a straight line add to 180°. 180 − 47 = 133°.
5. 31°
Angles in a triangle add to 180°. 180 − 87 − 62 = 31°.
6. 58°
Angles in a triangle add to 180°. 180 − 89 − 33 = 58°.
7. 54°
Angles in a triangle add to 180°. 180 − 76 − 50 = 54°.
8. 113°
Angles in a triangle add to 180°. 180 − 40 − 27 = 113°.
9. 135°
Sum of interior angles = (8 − 2) × 180 = 1080°. Each angle = 1080 ÷ 8 = 135°.
10. 120°
Sum of interior angles = (6 − 2) × 180 = 720°. Each angle = 720 ÷ 6 = 120°.
11. 144°
Sum of interior angles = (10 − 2) × 180 = 1440°. Each angle = 1440 ÷ 10 = 144°.
12. 108°
Sum of interior angles = (5 − 2) × 180 = 540°. Each angle = 540 ÷ 5 = 108°.
Worked examples
Two angles on a straight line. One is 119°. Find the other.
- Angles on a straight line add to 180°.
- 180 − 119 = 61°.
- Answer: 61°
A triangle has angles 49° and 77°. Find the third angle.
- Angles in a triangle add to 180°.
- 180 − 49 − 77 = 54°.
- Answer: 54°
Find the size of each interior angle of a regular 9-sided polygon.
- Sum of interior angles = (9 − 2) × 180 = 1260°.
- Each angle = 1260 ÷ 9 = 140°.
- Answer: 140°
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Reads the wrong scale on a protractor.
Correction: Start from the 0 on the arm you are measuring from.
Uses 360° for a triangle.
Correction: Triangle = 180°, quadrilateral = 360°.
Teacher tips
- · Estimate the angle type before measuring.
Parent tips
- · Spot right angles around the house.
Real-life applications
- · Ramps, clock hands, building and design.
Assessment objectives
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Frequently asked
- Is this Grade 3 Introducing Angle Bisector Techniques quiz really free?
- Yes. Every quizzes on FreeMathWorksheet is free to use, print and share — no account, no paywall and no watermark.
- What should a learner already know before this?
- Start with Introducing Angle Bisector Essentials, Perpendicular Bisector. Each one has its own free lesson, worksheet and quiz.
- How is the quiz sequenced?
- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Introducing Angle Bisector Techniques?
- Move on to Introducing Angle Bisector Word Problems, Introducing Angle Bisector Common Errors, Working with Angle Bisector, Angle Bisector in Context, which build directly on this idea.
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