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DG Unit 1

vocabulary from Ch 1 of Discovering Geometry

an angle that measures 90° Right Angle
a angle that measures between 0° and 90° Acute angle
an angle that measures between 90° and 180° Obtuse Angle
two or more lines in the same plane that never meet Parallel Lines
two lines that meet at 90° angles Perpendicular Lines
are formed by two intersecting lines; they share a common vertex but not a common side Pair of Vertical Angles
share a vertex and a common side and their non-common sides form a straight line Pair of Linear Angles
a pair of angles whose sum is 90° Pair of Complementary Angles
a pair of angles whose sum is 180° Pair of Supplementary Angles
closed figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others. Polygon
a line segment that connects two nonconsecutive vertices Diagonal
no diagonals are outside the polygon Convex Polygon
polygon whose sides have equal length Equilateral Polygons
polygon whose angles have equal measure Equiangular Polygons
polygon that is both equilateral and equiangular Regular Polygons
triangle that has one right angle Right Triangle
a triangle with 3 acute angles Acute Triangle
a triangle with one obtuse angle Obtuse Triangle
a triangle with no congruent sides Scalene Triangle
a triangle with three congruent sides Equilateral Triangle
a triangle with a least two congruent sides Isosceles Triangles
a quadrilateral with exactly one pair of parallel sides Trapezoid
a quadrilateral with distinct pairs of consecutive congruent sides Kite
a quadrilateral with two pairs of parallel sides Parallelogram
an equiangular parallelogram Rectangle
an equilateral parallelogram Rhombus
a regular quadrilateral Square
the set of all points in a plane at a given distance(radius) from a given point (center) in the plane Circle
Radius a segment from the center of the circle to a point on the edge of the circle
is a line segment containing the center, with its endpoints on the circle Diameter
two or more coplanar circles that share the same center Concentric Circles
is two points on the circle and the continuous (unbroken) part of the circle between the two points Arc of a Circle
an arc of a circle that is smaller than a semicircle Minor Arc
an arc of a circle larger than a semicircle Major Arc
an arc of a circle whose endpoints are the endpoints of a diameter Semicircle
an angle with its vertex at the center of the circle, and sides passing through the endpoints of an arc Central Angle
a line segment whose endpoints lie on the circle Chord
a line that intersects the circle only once Tangent
Created by: krolakd