No. They are usually defined in terms of a right triangle.
But the functions have relevance to all triangles and many other geometric shapes, as well.
Because a right angle will always measure 90 degrees no matter what the dimensions of the triangle are.
Using trigonometric ratios.
They are called Pythagorean triples such as 2, 4 and 5
The sine of an angle in a right triangle is the ratio of the length of the side opposite the angle to the length of the hypotenuse.In terms of ratios, the sine of an angle is defined, in a right angled triangle, as the ratio of lengths of the opposite side to the hypotenuse.
By using trigonometry that is applicable to a right angle triangle.
The cosine function on a right triangle is Adjacent leg divided by the hypotenuse of the triangle.
The property of similar triangles that facilitates the development of trigonometric ratios is the concept of proportionality in corresponding sides. In similar triangles, the ratios of the lengths of corresponding sides are equal, which allows us to define sine, cosine, and tangent for any angle in a right triangle. These ratios remain consistent regardless of the size of the triangle, enabling the extension of trigonometric functions beyond right triangles to any angle in the unit circle. This relationship provides a foundational basis for trigonometry.
They correspond to the six possible ratios of two sides of a right triangle: a/b, a/c, b/a, b/c, c/a & c/b.
A relevant notion triangle is a triangle where side a is the longest line of a the triangle, the side b is the second longest line from the top of the triangle down to the right side of the triangle. The last line is side c which is the shortest line from the top to the bottom left.
It starts with the simple Right-Angled Triangle and its 3 simple ratios: Sine, Cosine, Tangent...
There are six trigonometric ratios. Although applicable for any angle, they are usually introduced in the context of a right angled triangle. The full names of the main three ratios are sine, cosine, tangent. The other three ratios are reciprocals, which are cosecant, secant and cotangent, respectively.Suppose ABC is a triangle which is right angled at B. Thus AC is the hypotenuse.sin(A) = BC/AC = cos(C)cos(A) = AB/AC = sin(C)tan(A) = BC/AB
Yup, it follows the 3, 4, 5 rule (or in this case 6, 8, 10). Triangles with those ratios in the lengths of its sides are always right triangles