How to find the missing side of a triangle using cosine

The video tutorial emphasizes the importance of having a scientific calculator for solving trigonometric problems. It explains how to identify the hypotenuse, adjacent, and opposite sides in a right triangle and how to apply trigonometric functions like cosine to solve for unknown side lengths. The tutorial also highlights the need to set the calculator to degree mode and provides a step-by-step example of solving for a side using the cosine function.

Why is it important to have a scientific calculator for trigonometric problems?

• To solve algebraic equations

• To perform basic arithmetic

• To draw graphs

• To evaluate trigonometric functions

In a right triangle, which side is always opposite the right angle?

• Opposite side

• Hypotenuse

• Adjacent side

• Base

Which trigonometric function is used when you have the adjacent side and hypotenuse?

• Cosine

• Secant

• Tangent

• Sine

What mode should your calculator be in when solving trigonometric problems involving degrees?

• Graphing mode

• Degree mode

• Scientific mode

• Radian mode

If the cosine of 70 degrees is approximately 0.342, what is the length of the adjacent side if the hypotenuse is 10?

• 0.342

• 34.2

• 3.42

• 10.42