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 guides students through identifying triangle sides, specifically the hypotenuse, opposite, and adjacent sides. The tutorial demonstrates using the cosine function to solve for an unknown side length, ensuring the calculator is set to degree mode. The process involves calculating the cosine of a given angle and multiplying it by the hypotenuse to find the adjacent side. The tutorial concludes with a recap on identifying the adjacent side and rounding the result.

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

• To measure angles

• To solve algebraic equations

• To evaluate trigonometric functions

• To draw graphs

Which side of a right triangle is always opposite the right angle?

• Hypotenuse

• Base

• Adjacent side

• Opposite side

How do you determine the adjacent side in a right triangle?

• It is the longest side

• It is opposite the given angle

• It connects the angle and the 90-degree angle

• It is the shortest side

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

• Degree mode

• Graphing mode

• Scientific mode

• Radian mode

If the cosine of 70 degrees is used to find a side length, what is the next step after calculating the cosine?

• Add 10

• Multiply by 10

• Divide by 10

• Subtract 10