| 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 triangle of sand and soil deposited at the mouth of some large rivers. [1/2 definitions] |
| flag1 |
a piece of cloth, in the shape of a rectangle or triangle, with colors and designs. Flags are used for signaling or as symbols of a country or organization. [1/2 definitions] |
| gable |
the part of an outside wall that is shaped like a triangle because it fills the space between two sloping ends of a roof. |
| 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 |
the side opposite the right angle in a right triangle; the longest side of a right triangle. |
| isosceles triangle |
a triangle with two sides that are equal in length. |
| jib1 |
a sail that is shaped like a triangle and used in the front of a sailing boat. |
| 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. |
| pennant |
a long flag shaped like a triangle. Pennants are used on ships for signaling or as a sign for a school, team, or some other group. |
| pyramid |
a solid figure whose sides are triangles that meet at a single point. The base of a pyramid can be any flat shape with straight sides, such as a triangle or square. [1/3 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 with a right angle. |
| scalene |
of a triangle, having sides of unequal lengths. |