Circles

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# Circles - PowerPoint PPT Presentation

Circles. Honors Math – Grade 4. A. Circle. A circle is a plane figure. All the points on a circle are the same distance from a given point, called the center. Point A is the center of the circle. Circle A. A circle is named by its center point. C. E. B. D. G. F.

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## PowerPoint Slideshow about ' Circles' - manning

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Presentation Transcript

### Circles

A

Circle
• A circle is a plane figure.
• All the points on a circle are the same distance from a given point, called the center.
• Point A is the center of the circle

Circle A

A circle is named by its center point.

C

E

B

D

G

F

The Parts of Circle B
• All the line segments in Circle B have special names.
• Can you name any points on the circle?
• E, C, D, F, G

C

E

B

D

G

F

• A radius is a line segment with endpoints at the centerof the circle and on the circle.

C

E

B

D

G

F

Diameter
• A diameter is a line segment that passes through the center of the circle and has bothendpoints on the circle.
• is a diameter.

The length of the diameter is always equal to twice the length of the radius.

12 cm

If BE measures 6 cm, how long is CD?

C

E

B

D

G

F

Chord
• A chord is a line segment with both endpoints on the circle.
• is a chord.
• Are there any other chords in Circle B?
• Line segment CD

A diameter is a special chord.

Simple Closed Curve
• A simple closed curve is a path that begins and ends at the same point and does not cross itself.

Simple Closed Curves

Not simple closed curves

P

T

V

S

R

X

W

Q

Practice
• Name the circle and its center.
• How many diameters are shown? Name the diameters.
• Is TR a radius? Explain why or why not?
• Is VX a radius? Explain why or why not?