Term | Definition |
Acute Angle | An angle with a measure greater than 0 and less than 90. |
Acute Triangle | A triangle having three acute angles. |
Adjacent Angles | Angles that have the same vertex,share a common side and don't overlap. |
Base | In a power, the number used as a factor. |
Complementary Angles | Two angles are complementary if the sum of their measure is 90. |
Congruent | Having the same measure. |
Cross Section | The cross section of a solid and a plane. |
Edge | The line segment where two faces of a polyhedron intersect. |
Equilateral Triangle | A triangle having three congruent sides. |
Face | A flat surface of a polyhedron. |
Isosceles Triangle | A triangle having at least two congruent sides. |
Obtuse Angle | Any angle that measures greater than 90 less than 180. |
Obtuse Triangle | A triangle having one obtuse angle. |
Polyhedron | A three-dimensional figure with faces that are polygons. |
Prism | A polyhedron with two parallel congruent faces called bases. |
Pyrimid | A polyhedron with one base that is a polygon and three or more triangular faces that meet at a common vertex. |
Right Angle | An angle that measures exactly 90. |
Right Triangle | A triangle having one right angle. |
Scalene Triangle | A triangle having no congruent sides. |
Straight Angle | An angle that measures exactly 180. |
Supplementary Angles | Two angles are supplementary if their sum measures 180. |
Triangle | A figure with three sides and three angles. |
Vertex | A vertex of an angle is the common endpoint of the rays forming the angle. |
Vertical angles | Opposite angles formed by the intersection of two lines. |