# How to solve law of sines

## How do you solve the law of sines?

How to Use the Law of Sines with a Triangle

1. Using the law of sines and the proportion.
2. fill in the values that you know. Use the given values, not those that you’ve determined yourself. …
3. Use a calculator to determine the values of the sines (in this case, rounded to three decimal places).
4. Multiply each side by the denominator under b to solve for that length.

## Can you solve SSA using law of sines?

“SSA” is when we know two sides and an angle that is not the angle between the sides. use The Law of Sines first to calculate one of the other two angles; then use the three angles add to 180° to find the other angle; finally use The Law of Sines again to find the unknown side.

## How does sine rule work?

Sine Rule. The Sine Rule can be used in any triangle (not just right-angled triangles) where a side and its opposite angle are known. You will only ever need two parts of the Sine Rule formula, not all three. … Remember that each fraction in the Sine Rule formula should contain a side and its opposite angle.

## Where is angle of depression?

The angle of depression is the angle between the horizontal line of sight and the line of sight down to an object. For example, if you were standing on top of a hill or a building, looking down at an object, you could measure the angle of depression.

## How do you know if there are 2 triangles?

Add the new angle to the original angle. If their sum is less than 180°, you have two valid answers. If the sum is over 180°, then the second angle is not valid. If already one obtuse angle given, it can not have a second set of values.

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## Why does the law of sines not always work?

Cases when you can not use the Law of Sines

Since we do not know an opposite side and angle, we cannot employ the formula. Or, just look at it: Remember when you have 2 sides, the angle must be non-included. By the way, we could use the law of cosines to find the length of the side opposite the 115° angle.

## What is a AAS triangle?

Whereas the Angle-Angle-Side Postulate (AAS) tells us that if two angles and a non-included side of one triangle are congruent to two angles and the corresponding non-included side of another triangle, then the two triangles are congruent.

## Is SSA a congruence theorem?

Given two sides and non-included angle (SSA) is not enough to prove congruence. … But there are two triangles possible that have the same values, so SSA is not sufficient to prove congruence. In the figure above, the two triangles above are initially congruent.

## What is an ambiguous triangle?

The “Ambiguous Case” (SSA) occurs when we are given two sides and the angle opposite one of these given sides. The triangles resulting from this condition needs to be explored much more closely than the SSS, ASA, and AAS cases, for SSA may result in one triangle, two triangles, or even no triangle at all!

## What is formula for sine?

= 0.500. The sine function, along with cosine and tangent, is one of the three most common trigonometric functions. In any right triangle, the sine of an angle x is the length of the opposite side (O) divided by the length of the hypotenuse (H). In a formula, it is written as ‘sin’ without the ‘e’:

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## What is the formula for any triangle?

The area of a triangle can be expressed using the lengths of two sides and the sine of the included angle. AreaΔ = ½ ab sin C. You may see this referred to as the SAS formula for the area of a triangle.