# when to use cosine rule

Sine, Cosine and Tangent are the main functions used in Trigonometry and are based on a Right-Angled Triangle. Then you have to use the correct rule. For example, if all three sides of the triangle are known, the cosine rule allows one to find any of the angle measures. The ambiguous case causes a bit of confusion. Bundle. "I was writing an exam, but didn't know how to use the cosine rule. This is going to be 14.61, or 14.618. 1. Cosine Formula In the case of Trigonometry, the law of cosines or the cosine formula related to the length of sides of a triangle to the cosine of one of its angles. Cosine Rule: finding the area of a triangle given 3 sides Try the free Mathway calculator and problem solver below to practice various math topics. The Cosine Rule says that the square of the length of any side of a given triangle is equal to the sum of the squares of the length of the other sides minus twice the product of the other two sides multiplied by the cosine of angle included between them. Let B stands for the angle at B. Our tips from experts and exam survivors will help you through. The sine rule can be used to find an angle from 3 sides and an angle, or a side from 3 angles and a side. This will give you the missing angle: The trails form a triangle, and you are asked to find a missing trail length, which is like the side of a triangle. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/34\/Use-the-Cosine-Rule-Step-1-Version-2.jpg\/v4-460px-Use-the-Cosine-Rule-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/3\/34\/Use-the-Cosine-Rule-Step-1-Version-2.jpg\/aid388735-v4-728px-Use-the-Cosine-Rule-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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