Angles Game for Kids: Angle Ace
Angle Ace is a free geometry game where kids name types of angles, estimate angle sizes in degrees, and use angle facts to work out missing angles on a straight line, around a point and in a triangle.
Angle Ace
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- Ages
- 8–12
- School years
- Class 3–Class 6
- Skills
- Naming acute, right, obtuse, straight and reflex angles, Estimating angles in degrees using 90° and 180° as benchmarks, Knowing that angles on a straight line add up to 180°
- Time
- 2–5 minutes a round
- Cost
- Free, no sign-up
- Updated
How to play Angle Ace
- Choose a level: angle types, estimate, missing angles or mixed.
- Compare each angle with a right angle (90°) and a straight line (180°).
- For missing angles, use the angle facts: 180° on a straight line, 360° around a point and 180° in a triangle.
- Answer 10 questions, build a streak and try to earn three stars.
What your child learns
- Naming acute, right, obtuse, straight and reflex angles
- Estimating angles in degrees using 90° and 180° as benchmarks
- Knowing that angles on a straight line add up to 180°
- Knowing that angles around a point add up to 360°
- Knowing that the angles in a triangle add up to 180°
- Subtracting to find a missing angle
About Angle Ace
Angles measure an amount of turn, and they are measured in degrees. This game starts by naming angle types: acute angles are less than 90°, right angles are exactly 90° (shown with a small square), obtuse angles are between 90° and 180°, straight angles are 180°, and reflex angles are more than 180°. The estimate level then asks kids to choose the closest size, using a right angle and a straight line as benchmarks. Every angle is drawn accurately.
The missing angles level uses three key facts. Angles on a straight line add up to 180°, angles around a point add up to 360°, and the three angles in a triangle add up to 180°. Kids subtract the known angles to find the missing one. Wrong answers include common slips, like using 360° instead of 180°. Angle types suit Classes 3–4, and missing angles suit Classes 5–6.
Which level should my child play?
| School year | Suggested level |
|---|---|
| Class 3 | Angle types |
| Class 4 | Angle types, Estimate |
| Class 5 | Missing angles |
| Class 6 | Missing angles, Mixed |
Move up a level after getting three stars two or three times in a row.
🏆 Leaderboard
Full leaderboard →Play a round to get on the board! Create a free account to save your scores.
Frequently asked questions
What are the five types of angles?
Acute (less than 90°), right (exactly 90°), obtuse (between 90° and 180°), straight (exactly 180°) and reflex (between 180° and 360°).
How do you find a missing angle on a straight line?
Angles on a straight line add up to 180°. Add up the angles you know, then subtract the total from 180°. For example, if one angle is 130°, the other is 180° − 130° = 50°.
What age is this angles game for?
It suits children aged about 8 to 12. Start with angle types, then try estimating and missing angles.
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Practice at home is a great start. Success Tutoring offers personalised tutoring to build skills and confidence.