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An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle's angles must sum to 180° in Euclidean geometry , no Euclidean triangle can have more than one obtuse angle.
If each (triangle) face angle is strictly less than 90°, then the triangle mesh is said to be acute. Every polygon with n {\displaystyle n} sides has a nonobtuse triangulation with O ( n ) {\displaystyle O(n)} triangles (expressed in big O notation ), allowing some triangle vertices to be added to the sides and interior of the polygon. [ 1 ]
$ euk2eps Angle_obtuse_acute_straight.euk; Outline fonts $ eps2eps -dNOCACHE Angle_obtuse_acute_straight.eps Angle_obtuse_acute_straight2.eps; Fix bounding box $ ps2epsi Angle_obtuse_acute_straight2.eps Angle_obtuse_acute_straight.eps; Convert to Sketch $ pstoedit -f sk Angle_obtuse_acute_straight.eps Angle_obtuse_acute_straight.sk; Convert to SVG
Two lines that form a right angle are said to be normal, orthogonal, or perpendicular. [12] An angle larger than a right angle and smaller than a straight angle (between 90° and 180°) is called an obtuse angle [11] ("obtuse" meaning "blunt"). An angle equal to 1 / 2 turn (180° or π radians) is called a straight angle. [10]
In geometry, an isosceles triangle (/ aɪ ˈ s ɒ s ə l iː z /) is a triangle that has two sides of equal length or two angles of equal measure. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.
The lozenge shape is often used in parquetry (with acute angles that are 360°/n with n being an integer higher than 4, because they can be used to form a set of tiles of the same shape and size, reusable to cover the plane in various geometric patterns as the result of a tiling process called tessellation in mathematics) and as decoration on ...
The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.
For example, a right triangle may have angles that form simple relationships, such as 45°–45°–90°. This is called an "angle-based" right triangle. A "side-based" right triangle is one in which the lengths of the sides form ratios of whole numbers, such as 3 : 4 : 5, or of other special numbers such as the golden ratio.