click below
click below
Normal Size Small Size show me how
Geometry Vocabulary
Seventh Grade Geometry Vocabulary
Term | Definition |
---|---|
Acute Angle | An angle whose measure is in between 0 and 90 degrees. |
Obtuse Angle | An angles whose measure is in between 90 and 180 degrees. |
Straight Angle | An angle whose measure is exactly 180 degrees. |
Right Angle | An angle whose measure is exactly 90 degrees. |
Complementary Angles | When two angles have a sum of 90 degrees. |
Supplementary Angles | When two angles have a sum of 180 degrees. |
Vertical Angles | When two angles are formed by intersecting lines, are directly across from each other, and are congruent. |
Adjacent Angles | When angles are next to each other. |
Acute Triangle | A triangle whose angles measure 85, 15, and 80 degrees. |
Obtuse Triangle | A triangle whose angles measure 110, 24, and 46 degrees. |
Right Triangle | A triangle whose angles measure 62, 90, and 28 degrees. |
Scalene Triangle | A triangle that has no congruent side lengths. |
Isosceles Triangle | A triangle that has at lease two congruent sides. |
Equilateral Triangle | A triangle that has three congruent sides. |
Quadrilateral | A general name for a four-sided closed figure where all sides are line segments (no curves). |
Rectangle | A quadrilateral with four 90 degree angles. |
Square | A quadrilateral with four 90 degree angles and four congruent sides. |
Parallelogram | A quadrilateral with two pairs of parallel sides. |
Rhombus | A quadrilateral with four equal sides. |
Trapezoid | A quadrilateral with exactly one pair of parallel sides. |
Pentagon | A polygon with five sides. |
Hexagon | A polygon with six sides. |
Heptagon | A polygon with seven sides. |
Octagon | A polygon with eight sides. |
Nonagon | A polygon with nine sides. |
Decagon | A polygon with ten sides. |
Undecagon | A polygon with eleven sides. |
Dodecagon | A polygon with twelve sides. |
Perimeter | The linear distance around the outside side lengths of a figure. |
Area | The amount of squared units that covers the space of a two-dimensional figure. |
Surface Area | The amount of squared units that cover the area of the faces of a three-dimensional figure. |
Volume | The amount of cubic units that fill the inside space of a three-dimensional figure. |