Intro to Circles

What does "circumference" mean?

• Space a circle takes up
• Distance around a circle
• Line from one side of a circle to another
• Line from center of circle to side

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CCSS.HSG.CO.A.1

CCSS.HSG.GMD.A.1

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

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CCSS.7.G.B.4

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

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CCSS.7.G.B.4

What is the diameter?

• 8
• 16
• 10
• 4

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CCSS.7.G.B.4

What is the radius?

• 18
• 72
• 38
• 14

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CCSS.7.G.B.4

Determine the radius of the penny

• 59.66 mm
• 9.5 mm
• 38 mm
• 119.32 mm

Tags

CCSS.7.G.B.4

What is the diameter of a circle with a radius of 3 feet?

• 9.42 feet
• 18.84 feet
• 6 feet
• 12 feet

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CCSS.7.G.B.4

What is the radius of a circle with a diameter of 45 miles?

• 22.5 miles
• 141.3 miles
• 282.6 miles
• 90 miles

Tags

CCSS.7.G.B.4

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

Tags

CCSS.7.G.B.4

What is the formula for finding the circumference of a circle?

• C = r²

• C = rd

• A = π·r²

• C = π·d

Tags

CCSS.7.G.B.4