Grade 5 CIRCLE and Its Part.pptx

Circle and its Parts

1. 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.

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

3. 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:

4. 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

5. 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.

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

7. 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