1. 2 Circle A circle is the set of all points that are the same distance from a given point called the center.

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Presentation transcript:

1

2 Circle A circle is the set of all points that are the same distance from a given point called the center.

3 Center The given point from which all points on a circle are the same distance.

4 Circumference The distance around a circle.

5 Diameter The diameter of a circle is a line segment that joins any two points on the circle and passes through the center of the circle.

6 Radius The radius of a circle is a line segment joining the center of the circle and any point on the circle.

7 diameter radius circumference diameter = 2 times radius of diameter radius =

8 8cm r = d ÷ 2 r = 8 ÷ 2 r = 4 cm 6 yd Find the radius. Find the diameter. d = 2r d = 2۰6 d = 12 yd

9 The relationship of the circumference and the diameter of a circle is called pi. The symbol for pi is.

10 Think of fact families Circumference

11 Circumference WORDS: The circumference of a circle is equal to pi times its diameter or pi times twice its radius. Symbols: or

12 Circumference Symbols: or

13 The circumference of a circle is a little more than three times its diameter. The circumference of a circle is a little more than six times its radius.

14 Use. Find the circumference. 8cm

15 Use. Find the circumference. 4 ft

16 Use. Find the circumference. 6 mm 6 x 6

17 Use. Find the circumference. 7 mm 6 x 7