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| asterism |
in printing, three asterisks arranged in a triangle, used to call attention to a passage of text. [1/2 definitions] |
| babushka |
a woman's scarf, usu. triangle-shaped, that is worn on the head and tied under the chin. |
| 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. |
| cuneate |
of leaves, shaped like a wedge or triangle. [1/2 definitions] |
| delta |
a deposit of sand and soil at the mouth of some rivers, esp. large ones, usu. in the shape of a triangle. [1/2 definitions] |
| hexagram |
a starlike figure with six points made by superimposing two equilateral triangles such that each side of one triangle intersects one side and is parallel to another side of the other triangle. [1/2 definitions] |
| hypotenuse |
in a right triangle, the side opposite the right angle. |
| kerchief |
a square cloth, usually folded into a triangle, worn as a head covering or scarf. |
| median |
a straight line from the apex of a triangle to the midpoint of the opposite side, or from the middle of one nonparallel side of a trapezoid to the other. [1/6 definitions] |
| orthocenter |
the point at which the three altitudes of a triangle intersect. |
| pyramid |
a geometrical solid with a polygonal base from each side of which a triangle extends to a common point. [1/10 definitions] |
| 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. |
| right triangle |
a triangle in which two of the sides form a right angle. |
| scalene |
of a triangle, having sides of unequal lengths. |
| 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] |
| summer triangle |
a group of three very bright stars, Deneb, Vega, and Altair, that form a conspicuous triangle in the summer sky. |
| tangent |
in a right triangle, the ratio of the side opposite a given angle to the side adjacent to the angle. [1/5 definitions] |
| triangle |
any of various things that resemble such a figure, such as a draftsman's triangle, used in drawing angles, or a musical instrument consisting of a bent metal rod that is struck by another rod, or a three-sided piece of land. [1/2 definitions] |
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