# Question: Is cosine law only for right triangles?

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The Law of Cosines is a tool for solving triangles. That is, given some information about the triangle we can find more. From that, you can use the Law of Cosines to find the third side. It works on any triangle, not just right triangles.

## Can you use Law of Cosines on non right triangles?

The law of cosines can be used to find the measure of an angle or a side of a non-right triangle if we know: two sides and the angle between them or. three sides and no angles.

## Does cosine law work for all triangles?

Yes, the Law of Cosines works for all triangles. However, the proof depends on the shape a triangle, more precisely, how an altitude from some vertex falls onto the opposite side.

## What triangles can Law of Cosines be used on?

The Law of Cosines is used to find the remaining parts of an oblique (non-right) triangle when either the lengths of two sides and the measure of the included angle is known (SAS) or the lengths of the three sides (SSS) are known.

## Which law only works for right triangles?

The law of cosines applied to right triangles is the Pythagorean theorem, since the cosine of a right angle is 0.

## Does sin cos and tan only work on right triangles?

Q: Is sohcahtoa only for right triangles? A: Yes, it only applies to right triangles. If we have an oblique triangle, then we cant assume these trig ratios will work. We have other methods well learn about in Math Analysis and Trigonometry such as the laws of sines and cosines to handle those cases.

## Why trigonometry is applicable only for right triangles?

Answer: Trigonometric ratios apply to a right angle triangle only. It lets us find the lengths of the sides when the degrees of its angles are given. Also, we can use it to find out the degrees of its angle when the lengths of two of the sides are given.

## Why is PH a sin?

The ratio of perpendicular (p) to hypotenuse (h) of the triangle is called the sine of the angle α. sin α = p/h.

## Does 5/12/13 make a right triangle?

Yes, a right triangle can have side lengths 5, 12, and 13. To determine if sides of length 5, 12, and 13 units can make up the sides of a right...