Exploring Circle Properties
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Objective
I can identify and describe the properties of circles, including radius, diameter, circumference, and area.
Part 1 of 4
Warm-up video
mathantics · 7:56Vetted channel
We don't generate video — this one is by mathantics on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
The formula for finding the circumference of a circle is Circumference = Pi × diameter, or C = πd.
- 2
The formula for finding the area of a circle is Area = Pi × radius squared, or A = πr².
- 3
To find the radius when you are given the diameter, you divide the diameter by 2.
Part 3 of 4
Practice
12 questions
What is the formula for calculating the circumference of a circle?
What is the formula for calculating the area of a circle?
Part 4 of 4
Exit ticket
Quick comprehension check
“A circle has a radius of 5 cm. What is the area of the circle? Show your work, using π ≈ 3.14.”
Sample answer included in the free materials
Get the materials
Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
Complete lesson plan with answer keys and alternate activities
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