click below
click below
Normal Size Small Size show me how
Unit 4: Geometry
Vocabulary for Unit 4
Term | Definition |
---|---|
Acute Angle | An angle that measures less than 90 degrees. |
Right Angle | An angle that measures exactly 90 degrees. |
Obtuse Angle | An angle that measures more than 90 degrees. |
Equilateral | A triangle with all equal sides. |
Scalene | A triangle with no equal sides. |
Isosceles | A triangle with two equal sides. |
Complementary Angles | The sum of two or more angles that equal exactly 90 degrees. |
Supplementary Angles | The sum of two or more angles that equal exactly 180 degrees. |
Vertical Angles | A pair of angles that are on opposite sides of a vertex and are always equal. |
The sum of all angles in a triangle will always equal? | 180 degrees |
Triangle Inequality Theorem | The two shortest side lengths of a triangle must have a sum greater than the longest side length of a triangle. |
Area of a Rectangle/Square | A = length x width |
Area of a Parallelogram | A = base x height |
Area of a Circle | A = pi x radius squared |
Area of a Trapezoid | A = one half times height times the sum of base 1 and base 2 |
Area of a Triangle | A = one half times base times height |
Volume Formula | V = area of the base times height |
Radius | The length from the origin of a circle to the perimeter |
Diameter | The length through a circle that passes through the origin |
Circumference | The distance around a circle |
What is 2D? | 2- dimensional, a flat shape, no depth |
What is 3D? | 3-dimensional |
Define area. | Area covers the surface or face |
Define volume. | Volume fills a 3D object |
Characteristics of a Prism | Prisms are 3D shapes that always have two equal, parallel bases |
Characteristics of a Pyramid | Pyramids are 3D shapes that have one base opposite of the vertex |
Face | A face of a 3D shape is a flat surface |
Vertex | Where 3 or more edges intersect |
Edge | Where two faces intersect |
Origin | Center of a circle |
Surface Area | The measurement to cover all the faces of a 3D object |