# How to program law of cosines into ti-84

## Can you program a TI 84?

Introduction to TI-Basic on your TI-84 Plus CE

You can use TI-Basic to create a program on your graphing calculator. You can create a program that will calculate a desired output or control an experience, such as a game.

## How do you use the law of sines and cosines to solve a triangle?

This means we are given two sides and the included angle. For this type of triangle, we must use The Law of Cosines first to calculate the third side of the triangle; then we can use The Law of Sines to find one of the other two angles, and finally use Angles of a Triangle to find the last angle.

## What is the rule of sin?

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. You will need to know at least one pair of a side with its opposite angle to use the Sine Rule.

## How do you solve the law of cosines of a triangle?

To solve an SSS triangle:

1. use The Law of Cosines first to calculate one of the angles.
2. then use The Law of Cosines again to find another angle.
3. and finally use angles of a triangle add to 180° to find the last angle.

## How do I put programs on my TI 84?

1. Apps: Press the [apps] button on your calculator, and select the app you would like to use from the menu.
2. Programs: Press the [prgm] button on your calculator, select the program you want to use, and then press enter again to run it.
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TI-Basic

## What is the law of sines and cosines?

The Law of Sines establishes a relationship between the angles and the side lengths of ΔABC: a/sin(A) = b/sin(B) = c/sin(C). Another important relationship between the side lengths and the angles of a triangle is expressed by the Law of Cosines. …

## How do you use the law of cosines?

When to Use

The Law of Cosines is useful for finding: the third side of a triangle when we know two sides and the angle between them (like the example above) the angles of a triangle when we know all three sides (as in the following example)