The document provides instructions for constructing a circle with 8 points labeled A through H located 4 inches from the center point P. It then defines key terms related to circles including: diameter, radius, chord, tangent, central angle, arcs, and semicircles. Examples are given for each term and a practice problem is provided to test understanding of the circle terminology.

2. ACTIVITY :
1. Draw a point at the center of
a paper. Name it point P
2. Draw a another point that is
four inches away from point P.
Name it Point A.
P
A
3. Repeat Step 2 seven more
times. Make sure the other 7
points are in different
directions. Name the points
B,C,D,E,F,G, and H.
B
C
D
E
F
G
H
4. Connect all points A to H.

3. • A circle is a set of all
points in a plane that
are the same
distance from a point
called center.
Circle
“Circle P”

4. Parts of a Circle
• Diameter
The diameter of a circle is a line
segment whose endpoint lie on
the circles and which passes
through the center.
Examples:
• Chord
The chord of a circle is a line
segment that has endpoint on the
circle.
Examples:

5. • Radius
Any point from a circle to
its center is called radius.
Parts of a Circle
Examples:
• Tangent
A line is tangent to the circle if
they intersect at exactly one
and only one point.
I
J

6. Parts of a Circle
• Central Angle
A central angle is an angles
whose vertex is the center
point of a circle.
Examples:
• ARCS
Arcs are curves that lie on the
circle . They are segments of the
circle. is the symbol for an arc.

7. Parts of a Circle
• Semicircles
Semicircles are arcs whose
endpoints of a diameter. They
are also called half circles.
Examples:

8. Try this !
Directions: Use the figure at the right.
1. Name the circle.
“Circle C”
2. Identify the two diameters.
and
3. Identify the four radii.
and
4. Identify the four chords.
and
5. Name a tangent.
6. Identify the four central angles. and
7. Identify the four arcs. and
8 .Identify the two semicircles. and