Mathematics
Geometry
Conceptual
10–11 yrs
Parts of a circle
圆的各部分
Description
Illustrate and name parts of circles, including radius, diameter, and circumference; know that the diameter is twice the radius
Mastery Evidence
- Label the radius, diameter, and circumference on a circle diagram
- Calculate the diameter given a radius of 4.5 cm (diameter = 9 cm)
- Explain the relationship between radius and diameter in their own words
Assessment Prompt
If you give your child a round plate and a ruler, can they measure the diameter — and explain how the radius compares to the diameter?
Prerequisites 0
No prerequisites (entry-level topic)
