Trigonometry : Finding Angles

Study concepts, example questions & explanations for Trigonometry

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Example Questions

Example Question #1 : Finding Angles

 plank has one end on the ground and one end  off the ground. What is the measure of the angle formed by the plank and the ground?

Possible Answers:

Correct answer:

Explanation:

The length of the plank becomes the hypotenuse of the triangle, while the distance between the plank and the ground becomes the length of one side. To solve for the angle between the plank and the ground, you must find the value of . The sine of the angle is the value of the opposite side over the hypotenuse, which are values that we know.

Example Question #2 : Finding Angles

Given that angle A is 23.0o, side a is 1.43 in., and side b is 3.62 in., what is the angle of B?

https://www.varsitytutors.com/problem-admin/16159#problem_image_lightbox_2307

Possible Answers:

70o

55o

81.5o

90o

83.6o

Correct answer:

81.5o

Explanation:

 

 

Example Question #3 : Finding Angles

Two angles in a triangle are  and . What is the measure of the 3rd angle? 

Possible Answers:

There is not enough information to determine the angle measure. 

Correct answer:

Explanation:

The sum of the angles of a triangle is 180˚.

Thus, since the sum of our two angles is 100˚, our missing angle must be,

 

Example Question #4 : Finding Angles

If the hypotenuse of a right triangle has a length of 6, and the length of a leg is 2, what is the angle between the hypotenuse and the leg?

Possible Answers:

Correct answer:

Explanation:

The leg must be an adjacent side to the hypotenuse.  

Therefore, we can use inverse cosine to solve for the angle.  

First write the equation for sine of an angle.

Substitute the lengths given and solve for the angle.

Example Question #5 : Finding Angles

A skateboard ramp made so that the rider can gain sufficient speed before a jump is 15 feet high and the ramp is 17 feet long. What is the measure of the angle  between the ramp and the ground?

Possible Answers:

None of the other answers.

Correct answer:

Explanation:

For the angle in question we have the opposite side and the hypotenuse given to us. We can use the sine function.

Use the inverse sin to find the measure of an angle between these sides:

Example Question #2 : Finding Angles

What angle does the ramp make with the bottom of the stair?

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Possible Answers:

Correct answer:

Explanation:

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