9.9.1: Key Terms
- Page ID
- 118988
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Key Terms
- angle
- An angle is formed by two rays that share a common endpoint. Each ray is called a side of the angle.
- area
- The area is a measure of the surface covered by a figure.
- complementary angles
- If the sum of the measures of two angles is , then they are called complementary angles.
- cone
- A cone is a solid figure with one circular base and a vertex.
- cube
- A cube is a rectangular solid whose length, width, and height are equal.
- cylinder
- A cylinder is a solid figure with two parallel circles of the same size at the top and bottom.
- equilateral triangle
- A triangle with all three sides of equal length is called an equilateral triangle.
- hypotenuse
- The side of the triangle opposite the 90° angle is called the hypotenuse.
- irregular figure
- An irregular figure is a figure that is not a standard geometric shape. Its area cannot be calculated using any of the standard area formulas.
- isosceles triangle
- A triangle with two sides of equal length is called an isosceles triangle.
- legs of a right triangle
- The sides of a right triangle adjacent to the right angle are called the legs.
- perimeter
- The perimeter is a measure of the distance around a figure.
- rectangle
- A rectangle is a geometric figure that has four sides and four right angles.
- right triangle
- A right triangle is a triangle that has one angle.
- similar figures
- In geometry, if two figures have exactly the same shape but different sizes, we say they are similar figures.
- supplementary angles
- If the sum of the measures of two angles is , then they are called supplementary angles.
- trapezoid
- A trapezoid is four-sided figure, a quadrilateral, with two sides that are parallel and two sides that are not.
- triangle
- A triangle is a geometric figure with three sides and three angles.
- vertex of an angle
- When two rays meet to form an angle, the common endpoint is called the vertex of the angle.