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This is a list of two-dimensional geometric shapes in Euclidean and other geometries. For mathematical objects in more dimensions, see list of mathematical shapes. For a broader scope, see list of shapes.
Unlike a rectangle, which may collapse into a parallelogram from pressure to one of its points, [50] triangles are sturdy because specifying the lengths of all three sides determines the angles. [51] Therefore, a triangle will not change shape unless its sides are bent or extended or broken or if its joints break; in essence, each of the three ...
A right triangle ABC with its right angle at C, hypotenuse c, and legs a and b,. A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle (1 ⁄ 4 turn or 90 degrees).
A true 13×5 triangle cannot be created from the given component parts. The four figures (the yellow, red, blue and green shapes) total 32 units of area. The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = 13×5 / 2 = 32.5 units.
Pages in category "Types of triangles" The following 22 pages are in this category, out of 22 total. This list may not reflect recent changes. A.
This list of triangle topics includes things related to the geometric shape, either abstractly, as in idealizations studied by geometers, or in triangular arrays such as Pascal's triangle or triangular matrices, or concretely in physical space. It does not include metaphors like love triangle in which the word has no reference to the geometric ...
The angle included by the legs is called the vertex angle and the angles that have the base as one of their sides are called the base angles. [7] The vertex opposite the base is called the apex. [8] In the equilateral triangle case, since all sides are equal, any side can be called the base. [9]
Set square shaped as 45° - 45° - 90° triangle The side lengths of a 45° - 45° - 90° triangle 45° - 45° - 90° right triangle of hypotenuse length 1.. In plane geometry, dividing a square along its diagonal results in two isosceles right triangles, each with one right angle (90°, π / 2 radians) and two other congruent angles each measuring half of a right angle (45°, or ...