Tell whether the figure is a polygon. If it is, then classify it. Yes. A Pentagon. No. Find each square root. - = -10 = 7.

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Presentation transcript:

Tell whether the figure is a polygon. If it is, then classify it. Yes. A Pentagon. No. Find each square root. - = -10 = 7

Skills Check! When you finish turn your paper over and put it in the corner of your desk. No talking. When you are finished take out your NOTES and label it Properties of Circles.

This fixed point inside the circle is called the center. A circle is the set of all points that are at the same distance (equidistant) from a fixed point inside it. O Center A circle A circle has one and only one center.

Radius A line segment that joins any point on the circle to its center is called a radius. M A point on the circle Center O

 Radii ( plural of radius) of a circle are equal in length.  Infinite number of radii can be drawn in a circle. Radius Center K O L M N (Contd…)

Diameter AB A line segment that joins any two points on the circle and passes through its center is called a diameter. A B A circle O Center

A circle O M  Infinite number of diameters can be drawn in a circle.  As the radii of a circle are equal in length, its diameters too are equal in length. B (Contd…) Center A N

The length of the diameter of a circle is twice the length of its radius. Radius OM Center M O N Radius ON Diameter MN Diameter MN = Radius OM + Radius ON d = 2r Radius OM = Radius ON (Contd…)