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Lesson: Circumference of a Circle Mathematics • 7th Grade

In this lesson, we will learn how to find the circumference of a circle using the formula 2πr and solve problems involving quarter circles and semicircles.

Lesson Plan

Students will be able to

measure the circumference of a circle in a variety of ways,
deduce that the circumference divided by the diameter is always equal to ,
state the formulas and for the circumference of a circle, where is the diameter and is the radius,
calculate the circumference of a circle by approximating as 3.14 or .

Lesson Video

Lesson Playlist

02:11
02:45
+1

02:49

Lesson Worksheet

Q1:

Work out the circumference of the circle given that , giving your answer accurate to two decimal places.

Q2:

Work out the circumference of the circle, giving your answer accurate to two decimal places.

Q3:

Using 3.14 to approximate , what is the diameter of a circle of circumference 125.6 cm?