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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.
The reciprocal identities arise as ratios of sides in the triangles where this unit line is no longer the hypotenuse. The triangle shaded blue illustrates the identity 1 + cot 2 θ = csc 2 θ {\displaystyle 1+\cot ^{2}\theta =\csc ^{2}\theta } , and the red triangle shows that tan 2 θ + 1 = sec 2 θ {\displaystyle \tan ^{2 ...
Regular set square triangles differ (from a Marquois scales triangle) by being made and used according to the angles of their triangle (eg 45-45-90 or 30-60-90 degrees) rather than according to the ratio between the lengths of their sides.
Diagram demonstrating the ratios of the sides of a 45-45-90 special right triangle. ... == Summary == Diagram demonstrating the ratios of the sides of a 30-60-90 ...
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).
Trigonometry (from Ancient Greek τρίγωνον (trígōnon) ' triangle ' and μέτρον (métron) ' measure ') [1] is a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular, the trigonometric functions relate the angles of a right triangle with ratios of its side lengths.
Sines and cosines of common angles 0°, 30°, 45°, 60° and 90° follow the pattern ... Image mnemonic to help remember the ratios of sides of a right triangle.
A right triangle with side lengths in the ratio 1:2 is rep-5, ... the 45°-90°-45° triangle and the 30°-60°-90° triangle. 45°-90°-45° triangles ...