1
Right angle (90°)
Like the corner of a book. We mark it with a small square.
└ 90°
Angles
📖 Study · Angles
Angles
Angles tell us how much something has turned.
🎯 What you'll learn
- ✓Recognise right, acute, obtuse, straight angles
- ✓Measure with a protractor
- ✓Find angles in shapes
2
Acute (less than 90°)
Smaller than a right angle.
30° · 45°
3
Obtuse (more than 90°)
Bigger than a right angle but less than a straight line.
120° · 150°
4
Straight (180°)
A flat line. Half a full turn.
──── 180°