Term | Definition |
Point | An exact position in space. |
Line | An infinite set of points forming a straight path extending in two directions. |
Line segment | A part of a line defined by two endpoints. |
Plane | A flat surface that extends infinitely in all directions. |
Parallel Planes | Two planes can be parallel to each other, when they are parallel they are in a line. |
Angle | Two rays that share an endpoint. |
Vertex | The point at which two line segments,lines, or rays meet to form an angle. |
Complementary Angles | Two angles what have measures with a sum of 90 degrees |
Supplementary Angles | Two angles that have measured to 180 degrees. |
Congruent Angles | When two angles have the same measurement of angles. |
Acute Angle | An angle that measures less than 90 degrees. |
Obtuse Angle | An angle with a measurement greater than 90 and less than 180 degrees. |
Right Angle | An angle that measures 90 degrees. |
Straight Angle | An angle that measures 180 degrees. |
Reflex Angle | An angle that measures more than 180 degrees. |
Circle | A closed curve with all of its points in one plane and the same distance from a fixed point. |
Radius | The segment or the length of a segment from the center of a circle to a point on the circle. |
Diameter | A chord that passes through the center of a circle and has endpoints on a circle. |
Chord | Any line segment that joins tow points on a circle. |
Arc | The part curved between any two of its points. |
Cicumference | The measure in a square units of the interior region of a 2D or 3D figure. |
Polygons | A closed figure formed from a line segments that meet on ly at their endpoints. |
Acute Triangle | Measures less than 90 degrees. |
Obtuse Triangle | Measures greater than 90 degrees |
Right Triangle | Measures 90 degrees. |
Scalene Triangle | All sides measure different |
Isosceles Triangle | 2 sides measure the same |
Equilateral Triangle | All sides have the same measurement |
Parallelogram | A quadrilateral with two pairs of parallel and congruent angles |
Square | Parallelogram with 4 congruent sides and angles that are 90 degrees. |
Recdtangle | A quadrilateral with two pairs of congruent parallel sides and four right angles |
Rhombus | A parallelogram where all 4 sides are equal in length. |
Trapezoid | A quadrilateral with exactly one pair of parallel sides |
Pentagon | A polygon that has 5 sides |
Hexagon | A polygon that has 6 sides |
Octagon | A polygon that has 8 sides |
Ray | A part of a line with one end point and extends indefinitely in one direction |
Parallel Lines | Lines that always same the same distance apart and will never touch. |
Perpendicular LInes | Lines that intersect and form a right angle. |