Area and Circumference of Circles

Find the area of the circle

• 43.96

• 153.86

• 87.82

• 307.72

What is the formula for area of a circle given the radius?

• A = πr

• A = 2πr

• A = πd

• A = πr²

What is the area of a circle with a radius of 21 cm?

• 1384.74 cm²

• 2142.12 cm²

• 4348.08 cm²

• 1289.12 cm²

what is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

Match the following definitions to the terms:

• square units (units²)

• The distance around a circle

• Circumference of a circle

• feet, cm, inches

• Units of circumference

• Area of a circle

• How much space a circle takes up

• Units of area

What is the formula to find the area of a circle? ​ (a)  

Select the correct formula for finding area of a circle

• l x w

• b x h

Select the correct formula for finding area of a circle

(a)  

• l x w

• b x h

Explain how the concept of finding the area of a circle can be applied to real-life problems.

• Counting the number of people in a circular area

• Determining the temperature of circular objects

• Calculating the amount of space inside circular objects such as wheels, plates, or fields.

• Measuring the weight of circular objects

A baker is making a giant pizza with a diameter of 42 inches. a large jar of tomato sauce can cover 90 square inches of pizza. How many jars of tomato sauce does the baker need to buy to cover all the pizza?

Mathematical Equivalence

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