Circumference of Circles

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8 Terms

1
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What is the formula for the circumference of a circle?

C=2πr or C=πd

2
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What does the perimeter refer to?

The total distance around a shape.

3
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What is the perimeter formula for a square?

P=4s where 's' is the side length.

4
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What is the perimeter formula for a rectangle?

P=2(l + w) where 'l' is the length and 'w' is the width.

5
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What is the perimeter formula for a triangle?

P=a + b + c where a, b and c are the side lengths.

6
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What is the diameter of a circle?

The line passing through the centre joining two points on the circle, dividing it into two semicircles.

7
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What is the radius of a circle?

A line from the centre to a point on the circle.

8
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What is the perimeter of a circle called?

Circumference.