Calculating the Area of a Circle: Step-by-Step Guide

What does the area of a shape represent?

• The volume of the shape

• The space a shape occupies on a surface

• The perimeter of the shape

• The length of the shape

What is the formula for calculating the area of a circle?

• Area = radius * diameter

• Area = 2 * Pi * radius

• Area = Pi * radius squared

• Area = Pi * diameter

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CCSS.7.G.B.4

What is Pi?

• The ratio of a circle's diameter to its circumference

• The ratio of a circle's circumference to its diameter

• A special number equal to 3.14159

• Both B and C are correct

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CCSS.HSG.GMD.A.1

How can Pi be used in calculations?

• Using the Pi button on a calculator

• Using the value 3.14

• Both A and B are correct

• Pi is not used in calculations

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CCSS.HSG.GMD.A.1

What is the area of a circle with a radius of 3 inches?

• 28.27 square inches

• 14.13 square inches

• 9.42 square inches

• 56.52 square inches

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CCSS.7.G.B.4

How do you find the radius if you're given the diameter?

• Multiply the diameter by 2

• Pi times the diameter

• Divide the diameter by 2

• Square the diameter

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CCSS.7.G.B.4

What unit is used to express the area of a shape?

• Cubic units

• Linear units

• Square units

• Pi units

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CCSS.3.MD.C.6

Why do we round off the decimal in our area calculations?

• Both A and B

• Rounding off is not necessary

• Because Pi is an irrational number

• To make calculations easier

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What is the area of a circle with a diameter of 4 centimeters?

• 50.27 square centimeters

• 6.28 square centimeters

• 25.13 square centimeters

• 12.57 square centimeters

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CCSS.7.G.B.4

What is the area of a circle with a radius of 10 inches?

• 314.16 square inches

• 100 square inches

• 157.08 square inches

• 62.83 square inches

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CCSS.7.G.B.4