Title: Circumference of a Circle
Course: 2024 Math 5° (reference) > Section: 9 october - 15 october

Circumference: Lesson (Geometry Concepts)

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Examples: Determine the Circumference of a Circle

Review the examples of the circumference

Finding the Circumference of a Circle

The perimeter of a circle is called the circumference and is equal to the total distance around the edge.

The diameter, d, of a circle is the straight-line measurement from one point on the circle to another point on the circle that passes directly through the circle’s center.

A circle is a unique shape in that every point along the circumference is exactly the same distance from the circle’s center. This measurement of one half the diameter is called the radius, r.

(COPY THE FORMULAS IN THE MATH NOTEBOOK)

d=2r

The formula for the circumference of a circle is the value of pi times the circle’s diameter: C=πd

Since the diameter is twice the radius, the formula can also be written: C=2πr

Exercise Circumference

SOLVE EXERCISE IN THE MATH NOTEBOOK.

Find the circumference of the circle below.

- 25.12 in
Feedback: Very good!
- 25.12
Feedback: Don't forget the units!!! Try again
- 50.24in
Feedback: remember the formula: C=πd Try Again!!!

Circumference exercise 2

SOLVE EXERCISE IN THE MATH NOTEBOOK

Find the circumference of the circle given the radius.

- 18.84in
Feedback: Very good!!
- 18.84
Feedback: Don't forget the units!!! Try again!!!
- 9.42in
Feedback: Remember the forumula: C=2πr

Exercise 3

Find the circumference of a circle with a diameter of 5 cm.

Pi= 3.14

- 15.70cm
Feedback: Very good!
- 15.7cm
Feedback: Very good!
- 15.70 cm
- 15.7 cm
- @#wronganswer#@
Feedback: Try again!! Don't forget the UNITS and the formula depending of what information you have available.

Summary

End of lesson.