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# Geometry Chap. 10

### Vocabulary

Area of a Parallelogram (Theorem 10-1) The product of a base and the corresponding height.
Area of a Rectangle (Theorem 10-2) The product of its base and height.
Area of a Triangle (Theorem 10-3) Half the product of a base and the corresponding height
Base of a parallelogram Any one of its sides.
Altitude of a parallelogram A segment perpendicular to the line containing the base, drawn from the side opposite the base.
Height of a parallelogram The length of an altitude.
Base of a triangle Any one of its sides.
Height of a triangle The length of the altitude to the line containing that base.
Height of a trapezoid The perpendicular distance between the bases.
Radius of a regular parallelogram The distance from the center to a vertex.
Apothem The perpendicular distance from the center to a side.
Circle In a plane, a circle is the set of all points equidistant from a given point called the center.
Center The middle point of a circle or sphere, equidistant from every point on the circumference or surface.
Diameter A segment that contains the center of a circle and has both endpoints on the circle.
Radius A segment that has one endpoint at the center and the other endpoint on the circle.
Central Angle an angle whose vertex is the center of the circle.
Semicircle Half of a circle
Minor arc Smaller than a semicircle
Major arc Larger than a semicircle
Adjacent arcs Arcs of the same circle that have exactly one point in common.
Circumference The distance around the circle.
Pi The ratio of the circumference of a circle to its diameter.
Concentric Circles Coplaner circles that have the same center.
Arc Length A fraction of the circumference.
Sector of a circle A region bounded by an arc of the circle and the two radii to the arc's endpoints.
Segment of a circle A part of a circle bounded by an arc and the segment joining its endpoints.
Geometric probability Points on a segment or in a region of a plane represent outcomes. The geometric probability of an event is a ratio that involves geometric measures such as length or area.
Created by: osubuckeye1012

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