Calculating Area and Circumference of Circles
Grade 9th Grade · Math · 45 min
What's Included
Learning Objective
I can calculate the area and circumference of circles given the radius or diameter.
Warm-Up Video
Kayla Jones · 2:45
Area and Circumference of Circles
Guided Notes
3 key concepts
- 1
The formula for the area of a circle is Area = π * r², where r is the radius.
- 2
Circumference is a fancy word for perimeter when referring to circles, and it measures the distance around the outside of the circle.
- 3
The formula for the circumference of a circle is Circumference = 2 * π * r, where r represents the circle's radius.
Practice Questions
11 questions · Short answer
Exit Ticket
Quick comprehension check
“A circle has a radius of 12 cm. Calculate its area and circumference. Show your work, and round your answers to one decimal place. Use π = 3.14.”
Complete Lesson Package
Get all 3 ready-to-use resources:
Teacher Guide
Student Doc
Slides
