ACT Math : Trigonometry

Study concepts, example questions & explanations for ACT Math

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Example Questions

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Example Question #1 : Trigonometry

Triangle

What is the tangent of C in the given right triangle??

Possible Answers:

Correct answer:

Explanation:

Tangent = Opposite / Adjacent

Example Question #1 : Trigonometry

Consider a right triangle with an inner angle .

If

and

what is ?

Possible Answers:

Correct answer:

Explanation:

The tangent of an angle x is defined as

Substituting the given values for cos x and sin x, we get

Example Question #3 : Trigonometry

Triangle

Triangle ABC shown is a right triangle. If the tangent of angle C is , what is the length of segment BC?

Possible Answers:

Correct answer:

Explanation:

Use the definition of the tangent and plug in the values given:

tangent C = Opposite / Adjacent = AB / BC = 3 / 7

Therefore, BC = 7.

Example Question #4 : Trigonometry

If the sine of an angle equals , and the cosine of the same angle equals , what is the tangent of the angle?  

Possible Answers:

Correct answer:

Explanation:

The cosine of the angle is  and since that is a reduced fraction, we know the hypotenuse is  and the adjacent side equals .  

The sine of the angle equals , and since the hyptenuse is already  we know that we must multiply the numerator and denominator by  to get the common denominator of .  Therefore, the opposite side equals .  

Since , the answer is

Example Question #1 : Trigonometry

Soh_cah_toa

For the above triangle,  and . Find .

Possible Answers:

This triangle cannot exist.

Correct answer:

Explanation:

With right triangles, we can use SOH CAH TOA to solve for unknown side lengths and angles. For this problem, we are given the opposite and adjacent sides of the triangle with relation to the angle. With this information, we can use the tangent function to find the angle.

Example Question #1 : Trigonometry

Soh_cah_toa

In the above triangle,  and . Find .

Possible Answers:

Correct answer:

Explanation:

With right triangles, we can use SOH CAH TOA to solve for unknown side lengths and angles. For this problem, we are given the opposite and adjacent sides of the triangle with relation to the angle. With this information, we can use the tangent function to find the angle.

 

Example Question #7 : Trigonometry

Soh_cah_toa

For the above triangle,  and . Find .

Possible Answers:

This triangle cannot exist.

Correct answer:

Explanation:

With right triangles, we can use SOH CAH TOA to solve for unknown side lengths and angles. For this problem, we are given the opposite and adjacent sides of the triangle with relation to the angle. With this information, we can use the tangent function to find the angle.

Example Question #1 : Trigonometry

A laser is placed at a distance of  from the base of a building that is  tall. What is the angle of the laser (presuming that it is at ground level) in order that it point at the top of the building?

Possible Answers:

Correct answer:

Explanation:

You can draw your scenario using the following right triangle:

Theta5

Recall that the tangent of an angle is equal to the ratio of the opposite side to the adjacent side of the triangle. You can solve for the angle by using an inverse tangent function:

 or .

Example Question #1 : Tangent



Theta4

What is the value of  in the right triangle above? Round to the nearest hundredth of a degree.

Possible Answers:

Correct answer:

Explanation:

Recall that the tangent of an angle is equal to the ratio of the opposite side to the adjacent side of the triangle. You can solve for the angle by using an inverse tangent function:

 or .

Example Question #2 : Tangent

For the triangles in the figure given, which of the following is closest to the length of line NO?

Screen_shot_2013-06-03_at_5.56.50_pm

Possible Answers:

9

10

7

8

6

Correct answer:

9

Explanation:

First, solve for side MN. Tan(30°) = MN/16√3, so MN = tan(30°)(16√3) = 16. Triangle LMN and MNO are similar as they're both 30-60-90 triangles, so we can set up the proportion LM/MN = MN/NO or 16√3/16 = 16/x. Solving for x, we get 9.24, so the closest whole number is 9.

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