Problem SolvingThe Area of a Circle

Review

4) Find the diameter of the circle: 5) Find the circumference of the circle:

Review6) Find the area of the circle 7) Find the area of the circle:

8) Find the radius of the circle: 9) Find the diameter of the circle:

Crop Circles• Manuel and Matthias

decide to create a crop circle design in their father’s farm field.

▫ The biggest circle has a diameter of 16m.

▫ The smallest circle has a diameter one fourth the size of the biggest

▫ How much greater is the area of the biggest circle?

The Sprinkler• A water sprinkler can

spray water at a maximum distance of 12 m in all directions. What area of the garden can this sprinkler irrigate? round your answer to the nearest square meter.

The Garden• A circular garden with a

radius of 10 meters is surrounded by a walkway of width 1 meter. Find the area of the walkway (shaded part).

The Pizza• A circular pizza costs

$19.99. What is the cost of 1 square centimetre if the diameter of the pizza is 36 cm?

The Intermission Challenge• Boston College is hosting

an intermission challenge. A person shoots a puck from center ice and if it goes through the hole, he or she wins a million dollars.

• If the area of the puck is 18 cm squared, how big will they need to make the hole?