triangle
A polygon with three sides.
A triangle is a closed, two-dimensional geometric figure with three straight sides and three angles. Each angle of a triangle is formed by two sides of the triangle. The sum of the three angles in a triangle is always 180 degrees. There are several types of triangles including equilateral triangles that have three sides of equal length and three equal angles, isosceles triangles that have two sides of equal length and two equal angles, and scalene triangles that have no equal sides or angles. The area of a triangle can be calculated using the formula A=1/2bh where b is the base of the triangle and h is the height of the triangle (the perpendicular distance from the base to the opposite vertex). The perimeter of a triangle is the sum of the lengths of its three sides. The Pythagorean Theorem relates the sides of a right-angled triangle: a^2 + b^2 = c^2 where a and b are the two shorter sides (legs) and c is the hypotenuse (longest side) of the right-angled triangle.
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