Question | Answer |
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 |