Circles: Finding Circumference
Presentation
•
Mathematics
•
7th Grade
•
Medium
Standards-aligned
Shawn Sheridan
Used 449+ times
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10 Slides • 10 Questions
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Circles: Finding Circumference
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Radius:
This shows a circle with a radius of 50 cm, the distance from the center to the outside of the circle
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Multiple Choice
What is the radius of this circle?
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Diameter:
This image shows a circle with a diameter of 12 inches, the distance from one side to the other going through the center
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Multiple Choice
What is the diameter of this circle?
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Radius and Diameter
The diameter is twice the radius so: Diameter = Radius x 2
The radius is half the diameter so: Radius = Diameter divided by 2
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Multiple Choice
This circle shows the diameter, what is the radius of this circle?
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Multiple Choice
This image shows the radius of a circle, what is the circles diameter?
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Circumference of a Circle
This image shows that circumference is the distance around the entire circle - the red lines length
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Circumference Formula #1
Since a circle has curved sides, we must use a mathematical formula to find the Circumference there are two formulas we can use
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Circumference Formula #1
In this formula we multiply (3.14) times the diameter of the circle to find the circumference
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Circumference Formula #2
Because diameter is radius times 2, we can also use this formula where we multiply pi (3.14) times the radius and also times 2.
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Calculating Circumference
We use the formula to calculate the circumference:
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Multiple Choice
What is the circumference of this circle? round to the nearest hundredth and use 3.14 for
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Multiple Choice
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Multiple Choice
What is the circumference of this circle?
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Multiple Choice
What is the diamter of this circle?
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Multiple Choice
What is the diameter of this circle?
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Multiple Choice
What is the radius of this circle?
Circles: Finding Circumference
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