Parts of a circle
Mathematics · Geometry · conceptual
Illustrate and name parts of circles, including radius, diameter, and circumference; know that the diameter is twice the radius
What mastery looks like
- 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
Check your understanding
If you give Parts of a circle a round plate and a ruler, can they measure the diameter — and explain how the radius compares to the diameter?
Prerequisites
None — this is a foundational concept.