Mathematics
Geometry
Conceptual
9–10 yrs
What Is an Angle?
什么是角？
Description
Understand that an angle is a geometric shape formed by two rays sharing a common endpoint (vertex); recognise angles in real-life contexts and 2-D shapes
Mastery Evidence
- Identify the vertex and arms of an angle in a diagram
- Find examples of angles in the classroom (e.g. open door, clock hands)
- Explain why two rays meeting at a point form an angle
Assessment Prompt
If you draw two lines starting from the same point on paper, can your child tell you that the space between them is an angle — and point to the vertex where they meet?
Unlocks 1
Degrees and turns
