Page 880 - Algebra 1

Parts of a Circle
Skills Bank Lesson 19
A circle is the set of points in a plane that are a fixed distance from a given point, the center.
A chord is a line segment that connects 2 points on
the circle. JK and GH are chords.
J
A diameter is a chord that passes through the center of the circle.
R
PR is a diameter. K
O A
H
A circle is named by its center. This is circle O.
segment that connects
a point on the circle with
the center of the circle.
AO,BO,PO,and RO are radii.
B
DAE
G
B PG
A radius is a line
Example
1
Naming Parts of a Circle
Name the center, radii, diameters, and chords.
SOLUTION
Center A
−− −−− −− −−
Radii AB, AD, AE, AG −−
The plural of radius is radii.
A diameter is also a chord.
Name the center, radii, diameters, and chords of each circle. a.T b.
Diameters DE
−− −− −−
Chords CF, CB, DE Skills Bank Practice
C
F
Z Y
X
W
U
V
WZ
XY
T
Skills Bank 865
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