Partial Circle Area and Circumference

Mark created a flower bed that is semicircular in shape. The diameter of the flower bed is 5m. Approximate π to be 3.14. What is the area of the flower bed?

Identify the parts of the circle and show how you would find the area and circumference.

Groups:

(a) radius

,

(b) diameter

,

(c) circumference

,

(d) area

A circular mirror has a 2 inch frame around it. The mirror itself is 8 inches in diameter. What is the area of the frame? Use 3.14 for pi.

This formula is used to find what?

• Area

• Circumference

An architect is making a plan for a new circular playground. If the picture below is the playground, how much fencing needs to go up to keep the kids in the circle? Use 3.14 for π.

• 3,215 m

• 201 m

• 402 m

• 100 m

Match the following definitions to the terms:

• How much space a circle takes up

• feet, cm, inches

• Area of a circle

• Circumference of a circle

• The distance around a circle

• Units of area

• square units (units²)

• Units of circumference

Michael wants to create a tile pattern out of three quarter circles for his kitchen backsplash. Find the area of the tile pattern.
Approximate 3.14 for pi.
***do not use labels in your answer**