The Area and Componants of Circles

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Circles Vocabulary

• pi or π (pi) Π is a mathematical constant with a value of 3.14

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Circles Vocabulary

• Diameter The distance across a circle through its center point. It is two X the Radius

d = 2r

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Circles Vocabulary

• Radius The radius of a circle is the distance from the center of the circle to the outside edge. It is ½ the Diameterr = d ÷ 2

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Circles Vocabulary

• Circumference The circumference of a circle is the perimeter -- the distance around the outer edge.2πr

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Circles Vocabulary

• Area of a Circle Area = πr2

Area = where r = the radius of the circle & π = 3.14A = πr2

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Circles Vocabulary

• The Chord of a Circle

A chord of a circle is a line segment that connects one point on the edge of the circle with another point on the circle. The diameter is a chord -- it's just the longest chord!)

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Circles Vocabulary

• The Arc of a Circle

An arc of a circle is a segment of the circumference of the circle.

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Circles Vocabulary