How to use the inverse cosine function to find the missing angle of a triangle

The video tutorial guides students through solving for an angle in a right triangle using trigonometry. It begins with identifying the angle and sides of the triangle, then selecting the appropriate trigonometric function, cosine, based on the given sides. The instructor demonstrates how to calculate the angle using the cosine inverse function and emphasizes the importance of verifying calculations. The lesson concludes with a brief discussion on rounding results.

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

• Identify the hypotenuse

• Identify the angle

• Identify the opposite side

• Identify the adjacent side

Which sides are involved when using the cosine function in trigonometry?

• Hypotenuse and base

• Adjacent and hypotenuse

• Adjacent and opposite

• Opposite and hypotenuse

What equation is set up to find the angle X using cosine?

• cosine of X equals opposite over adjacent

• cosine of X equals hypotenuse over adjacent

• cosine of X equals adjacent over hypotenuse

• cosine of X equals opposite over hypotenuse

How do you solve for the angle X when you have the cosine value?

• Use the sine inverse function

• Use the secant function

• Use the cosine inverse function

• Use the tangent function

What is the approximate value of angle X after calculation?

• 60.00 degrees

• 36.87 degrees

• 30.00 degrees

• 45.00 degrees