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| cone |
in geometry, a three-dimensional shape created by rotating a right triangle 360 degrees on its vertical axis. [1/5 definitions] |
| cosine |
in trigonometry, the ratio between the length of the side next to one of the acute angles in a right triangle and the length of the hypotenuse. |
| cotangent |
in trigonometry, the ratio between the side adjacent to a given acute angle in a right triangle and the opposite side. |
| hypotenuse |
in a right triangle, the side opposite the right angle. |
| Pythagorean theorem |
in geometry, the theorem that in a right triangle the square of the hypotenuse is equal to the sum of the squares of the other two sides. |
| secant |
a trigonometric function, the reciprocal of the cosine, that for an acute angle is equal to the ratio of the hypotenuse to the side adjacent to the given angle in any right triangle that incorporates the angle. [1/4 definitions] |
| sine |
in trigonometry, the ratio, in a right triangle, of the length of a side opposite an acute angle to the length of the hypotenuse. [1/2 definitions] |
| tangent |
in a right triangle, the ratio of the side opposite a given angle to the side adjacent to the angle. [1/5 definitions] |
| trigonometric function |
a function, such as sine, cosine, or tangent, expressed as the ratio of different sides of a right triangle. |
| trigonometry |
the branch of mathematics concerned with the relationships between sides and angles of right triangles, and with calculations based on these relationships. |
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