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=Unit 1 - Naming and Constructing Geometric Figures=

__Lesson 1-2 Vocabulary__

 * point - An exact location in space.
 * line segment - A part of a line between and including two points, called endpoints. A line segment is often named by its endpoints.
 * line - A 1-dimensional straight path that extends forever in opposite directions. A line is named using two points on the line.
 * endpoint - A point at the end of a line segment, ray, or arc.
 * ray - A part of a line starting at the ray's endpoint and continuing forever in one direction. A ray is named by its end point and another point on it.

__Lesson 1-3 Vocabulary__
 * angle - A figure formed by two rays or line segments, with a common endpoint called the vertex. The rays or segments are called the sides of the angle. An angle is measured in degrees between 0 and 360.
 * vertex - The point at which the rays of an angle, the sides of a polygon, or the edges of a polyhedron meet.
 * right angle - A 90 degree angle.
 * triangle - A three sided polygon.
 * quadrangle/quadrilateral - A four sided polygon.
 * square - A rectangle with all sides of equal length. All angles are 90 degrees.
 * rhombus - A parallelogram with all sides the same length.
 * rectangle - A parallelogram with all right angles.
 * parallelogram - A quadrilateral with two pairs of parallel lines. Opposite sides and opposite angles have the same measure.
 * trapezoid - A quadrilateral that has exactly one pair of parallel lines.
 * kite - A quadrilateral with two distinct pairs of adjacent sides of equal length.

__Lesson 1-4__

 * parallel lines - Lines in a plane that never meet. Two parallel lines are always the same distance apart.
 * intersecting lines - Lines that share a common point.
 * perpendicular lines - Two lines that intersect at right angles.

__Lesson 1-6 & 1-7__



 * circle - The set of all points in a plane that are the same distance from a fixed point in the plane. The fixed point is in the center of the circle.
 * diameter - A line segment that passes through the center of a circle and has endpoints on the the circle.
 * radius - A line segment from the center of a circle to any point on the circle.
 * concentric circle - Circles that have the same center, but have radii of different lengths.
 * chord - a line segment whose endpoints are on a circle, but it does not travel through the center.
 * congruent - Having the same size and shape.