JENECONKMaths Universe

Angles

Ages 9–13

Difficulty adapts to you

Angles

An angle is the amount of turn between two lines that meet at a point. We measure angles in degrees (°).

Your goals

  • ✓You can measure and classify angles.
  • ✓You can use angle, degree correctly.
  • ✓You can compare the angle with a right angle before naming it.

Words to know

angle:
The amount of turn between two rays meeting at a vertex.
degree:
A unit used to measure an angle, written °.

Examples

  • 1Acute angle: less than 90°. Right angle: exactly 90°.
  • 2Obtuse angle: between 90° and 180°. Straight angle: exactly 180°.

Check these

  • • Do not judge an angle by the length of its arms.
  • • Keep every number, symbol, label, and unit in its correct place.
  • • Show enough working to check how you reached your answer.

Helpful habits

  • • Read the whole question before choosing what to do.
  • • Show one clear step at a time and check each step.
  • • If you are stuck, draw a model, try smaller numbers, or revisit the example.

Now try your own

Create your own angles example, solve it, and explain how you checked it.

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