How to use the inverse cosine function to determine the missing angle

The video tutorial guides students through solving a trigonometry problem involving finding angle B in a triangle. The teacher explains how to label the sides of the triangle, choose the appropriate trigonometric function, and calculate the angle using the cosine inverse. The tutorial emphasizes the importance of understanding the relationship between the sides and the angle, and concludes with instructions for similar homework problems.

What is the first step in solving for an angle in a right triangle?

• Use the tangent function

• Calculate the sine

• Label the hypotenuse

• Find the opposite side

Which side is labeled as the adjacent side in a right triangle?

• The longest side

• The side next to the angle and hypotenuse

• The side opposite the angle

• The side with the smallest length

When should you use the cosine function in a right triangle?

• When you know the opposite and adjacent

• When you know the adjacent and hypotenuse

• When you know the opposite and hypotenuse

• When you know all three sides

What is the formula for finding angle B using cosine?

• cos(B) = hypotenuse/adjacent

• cos(B) = adjacent/opposite

• cos(B) = adjacent/hypotenuse

• cos(B) = opposite/hypotenuse

How do you find the angle B after calculating cos(B) = 25/30?

• Multiply by 30

• Subtract 25 from 30

• Use the inverse cosine function

• Use the sine function