Types of angles (age 8+)
角的类型（8岁以上）
Description
Use and interpret standard geometric diagram conventions: mark right angles with a small square, equal lengths with single or double tick marks, and equal angles with arc marks; label angles in three-letter notation (∠ABC) and individual angles with a single letter or number; draw diagrams showing angles at a point, angles on a straight line, and angles inside polygons with these conventions; read diagrams with these marks to identify given information and find unknown values
Mastery Evidence
- Mark a right angle with a small square symbol in a diagram and explain what it means
- Use tick marks to show equal lengths in a shape and double tick marks for a second pair of equal sides
- Read and interpret angle notation (e.g. angle ABC) and identify the angle being referred to in a diagram
Assessment Prompt
If your child's maths diagram shows a small square in one corner and matching arc marks on two other angles, can they tell you what each mark means — and use them to figure out a missing angle without re-measuring?
Prerequisites 0
No prerequisites (entry-level topic)
