Exploring Circle Parts
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Objective
I can define and apply the terms radius, diameter, chord, tangent, secant, and arc to solve problems involving circles.
Part 1 of 4
Warm-up video
Professor Dave Explains · 4:58Vetted channel
We don't generate video — this one is by Professor Dave Explains 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 radius of a circle is the distance from the center to any point on the circle, while a chord is a line segment with both endpoints on the circle.
- 2
A diameter is a chord that passes through the center of the circle, and its length is always twice the length of the radius.
- 3
The distance around the circle is called the circumference, and the ratio between the circumference and the diameter is represented by π (pi).
Part 3 of 4
Practice
10 questions
Define a circle in your own words, based on the description provided in the video.
What is the relationship between the radius and the diameter of a circle?
Part 4 of 4
Exit ticket
Quick comprehension check
“A circle has a radius of 7 cm. A chord is drawn that does NOT pass through the center of the circle. What is the longest possible length of this chord? Explain your answer.”
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
Student Handout
Printable worksheet
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