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Point Line Ray Intersect An exact location A straight path that goes on forever. (180 degrees) A part of a line that only goes on in one direction without stopping. It has an endpoint. Cross at one point Perpendicular Parallel Congruent Line Segment Mid Point Special intersecting lines, rays, or segments. (Form 90 degrees) lines, rays, or segments that never touch. They always remain same distance apart. Line segments that are the same size (≅) Halfway between endpoints of a line segment Angle Vertex Acute Angle Right Angle Two rays with same endpoint Endpoint of two rays. Angle smaller than 90 degrees Angle exactly 90 degrees Obtuse Angle Straight Angle Vertical angles Congruent Angles Angle larger than 90 degrees Angle measuring exactly 180 degrees (forms a line) pair of angles that are formed by intersecting lines and have no side in common. have the same measure Adjacent Angles Complementary Angles Supplementary Angles Acute Triangle pair of angles with a common vertex and a common side but no common interior points. two angles whose measure adds up to 90 degrees. Two angles whose measures add add up to 180 degrees All angles are acute angles Right Triangle Has one angle that is 90 degrees Obtuse Triangle One angle is an obtuse angle Equilateral Triangle All sides are congruent (same size) Isosceles Triangle At lease two sides are congruent Scalene Triangle Trapezoid No sides are congruent (same size) Quadrilateral with one pair of parallel sides Quadrilateral Four sided closed shape (polygon) The sum is 360 degrees Parallelogram Quadrilateral with opposite sides the same length opposite sides parallel Rhombus Square Rectangle Circle Quadrilateral in which all sides are the same length, opposite sides are parallel, and all sides are congruent (Also classified as parallelogram) A quadrilateral with all sides congruent, all sides are the same length, and all the angles are 90 degrees. (Also classified as rhombus, rectangle and parallelogram) Quadrilateral with 4 right angles, opposite sides are the same length all angles are 90 degrees. (Also classified as parallelogram) closed plane figure made up of all points the same distance from a point called the center. It is named by the center. Radius Chord Diameter Central Angle any line segment that connects the center point to a point on the circle (Plural radii) Any line segment that connects two points on the circle. Any line segment that connects two points in a circle. angle whose vertex is the center of the circle. Arc Semi Circle Sector part of the circle connecting two points of the circle arc that connects the endpoints of a diameter region bounded by two radii and an arc.