Find the missing length of a triangle using the cosine function

The video tutorial explains how to solve problems using right triangle trigonometry. It covers the properties of right triangles, including the hypotenuse and legs, and introduces the concept of theta as an angle. The tutorial details the use of sine, cosine, and tangent functions to solve problems by using the ratios of triangle sides. A practical example is provided, demonstrating how to calculate the length of a side using the sine function. The video concludes with a recommendation to visit a website for more practice problems.

What is the longest side of a right triangle called?

• Adjacent

• Opposite

• Theta

• Hypotenuse

Which angle is typically denoted by a small box in a right triangle?

• Theta

• 90 degrees

• 60 degrees

• 45 degrees

What does the mnemonic 'SOH CAH TOA' help you remember?

• The names of triangle sides

• The types of triangles

• The properties of angles

• The ratios of trigonometric functions

If you know the opposite side and hypotenuse, which trigonometric function would you use?

• Secant

• Tangent

• Sine

• Cosine

In the example problem, what is the calculated length of the opposite side when Theta is 34 degrees and the hypotenuse is 20?

• 13.4

• 12.3

• 10.5

• 11.2