1. The Area and Componants of Circles

2. Free powerpoint template: www.brainybetty.com 2 Circles Vocabulary pi or π (pi) Π is a mathematical constant with a value of 3.14

3. Free powerpoint template: www.brainybetty.com 3 Circles Vocabulary Diameter The distance across a circle through its center point. It is two X the Radius d = 2r

4. Free powerpoint template: www.brainybetty.com 4 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 Diameter r = d ÷ 2

5. Free powerpoint template: www.brainybetty.com 5 Circles Vocabulary Circumference The circumference of a circle is the perimeter -- the distance around the outer edge. 2πr

6. Free powerpoint template: www.brainybetty.com 6 Circles Vocabulary Area of a CircleArea = πr 2 Area = where r = the radius of the circle & π = 3.14 A = πr 2

7. Free powerpoint template: www.brainybetty.com 7 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!)

8. Free powerpoint template: www.brainybetty.com 8 Circles Vocabulary The Arc of a Circle An arc of a circle is a segment of the circumference of the circle.

9. Free powerpoint template: www.brainybetty.com 9 Circles Vocabulary