Calculating Circle Area from Circumference

What is the formula for the circumference of a circle?

• Circumference = Pi * diameter

• Circumference = diameter / Pi

• Circumference = Pi * radius

• Circumference = 2 * Pi * radius

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CCSS.7.G.B.4

What value of Pi is used in the calculations?

• 3.14159

• 3.14

• 22/7

• 3.142

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What is the first step to find the area when given the circumference?

• Divide the circumference by 2

• Calculate the diameter

• Square the circumference

• Calculate the radius

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CCSS.7.G.B.4

If the circumference of a circle is 2826 meters, what is the diameter?

• 1413 meters

• 2826 meters

• 282.6 meters

• 9 meters

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CCSS.7.G.B.4

How do you calculate the radius if you know the diameter?

• Multiply the diameter by 2

• Divide the diameter by 2

• Multiply the diameter by Pi

• None of the above

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CCSS.7.G.B.4

What is the area of a circle if the radius is 4.5 meters?

• 63.585 square meters

• 20.25 square meters

• 42.39 square meters

• 14.13 square meters

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CCSS.7.G.B.4

For a circle with a circumference of 94.2 inches, what is the diameter?

• 15 inches

• 30 inches

• 188.4 inches

• 47.1 inches

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CCSS.7.G.B.4

What is the radius of a circle with a diameter of 30 inches?

• 30 inches

• 7.5 inches

• 15 inches

• 60 inches

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CCSS.7.G.B.4

How do you find the area of a circle with a radius of 15 inches?

• 76.5 square inches

• 450 square inches

• 225 square inches

• 706.5 square inches

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CCSS.7.G.B.4

Which website is mentioned for further learning and resources?

• circleland.com

• learnmath.com

• landomath.com

• mathcircle.com

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