Question | Answer |
Point | A location in space |
Line | A straight path that continues in two directions without ending |
Line segment | A straight path that has two endpoints. |
Ray | A straight path that starts at one endpoint and continues in one direction without end. |
Angle | Figure made by two rays with a common endpoint. |
Vertex | The center point of an angle |
Protractor | A tool used to measure the degrees of angles |
Acute | An angle that is less than 90 degrees |
Obtuse | An angle that is more than 90 degrees |
Right | An angle that is exactly 90 degrees, a square corner |
Vertical angles | Angles that are opposite of each other, they are also congruent |
Congruent | Having the same size and shape or measurement |
Adjacent angles | Angles that share a common side or ray |
Supplementary angles | angles that add to 180 degrees together |
Complementary angles | Angles that add to 90 degrees together |
Skew lines | Lines in different planes that never cross |
Intersecting lines | Lines that cross at one point |
Parallel lines | Lines in the same plane that never cross |
Perpendicular lines | Lines that cross at 90 degree angles |
Equilateral triangle | A triangle with 3 equal sides |
Scalene triangle | A triangle with 0 equal sides |
Isosceles triangle | A triangle with exactly 2 equal sides |
Rhombus | A quadrilateral with 4 equal sides |
Square | A quadrilateral with 4 equal sides and 4 right angles |
Trapezoid | A quadrilateral with exactly 2 parallel sides |
Rectangle | A quadrilateral with two pairs of parallel sides and 4 right angles |
Parallelogram | A quadrilateral with two pairs of parallel sides |
Quadrilateral | A polygon with 4 sides |
Triangle | A polygon with 3 sides |
Pentagon | A polygon with 5 sides |
Hexagon | A polygon with 6 sides |
Octagon | A polygon with 8 sides |
Polygon | A simple, closed, plane figure with at 3 or more straight sides |
Translation | A movement of a figure along a straight line |
Rotation | A movement of a figure around a point |
Reflection | A movement of a figure in which the figure is “flipped” - the location and position changes |
Line of symmetry | The line on a figure which divides the figure so that the two parts are “mirror” images of each other. If folded on this, both parts will match exactly. |
Plane | A flat surface that extends without end in all directions |
Geometry | The study of “Earth Measurement” involving shapes, angles, points, lines |
Circle | a set of all points in a plane that are equal distance from a point called the center |