Finding Missing Side Lengths in Trigonometry

Finding Side Lengths Using Trigonometry

By Deb Scott

​Objective: Use Trig to find side lengths

Multiple Choice

The side labelled x is the:

• adjacent side

• Opposide side

• Hypotenuse

Multiple Choice

The side labelled y is the:

• adjacent side

• Opposide side

• Hypotenuse

Multiple Choice

The side labelled z is the:

• adjacent side

• Opposide side

• Hypotenuse

Multiple Choice

Ms Scott wants to find the value of h. Which two side lengths should she use?

• A and H

• A and O

• O and H

Multiple Choice

Which trig ratio would you use to solve for x?

• Sine

• Cosine

• Tangent

Using Cos, set up a proportion and solve for x.

Set up a proportion and solve for y.

Solve the following triangle for x and y.

Multiple Choice

Find the length of side w.

• 21.4 cm
• 18.0 cm
• 36.5 cm
• 43.6 cm

Multiple Choice

Solve for x.

• 10
• 11.3
• 12.0
• 15.0

Multiple Choice

Solve for x.

• 50.7
• 50.1
• 60.7
• 61.0

Multiple Choice

Find the missing value.

Round to the nearest tenths.

• 33.9 mm

• 3.4 mm

• 10.5 mm

• 36.2 mm

Fill in the Blanks

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Poll

I know how to set up equations with sine, cosine, and tangent.

• Every time

• Most of the time

• Some of the time

• Rarely did I get this correct

Poll

$$\sin\left(30\right)=\frac{x}{10}$$  

I know how to solve equations like this one, where the x in in the numerator

• Every time

• Most of the time

• Some of the time

• Rarely did I get this correct

Poll

$$\sin\left(30\right)=\frac{10}{x}$$  

I know how to solve equations like this one, where the x in in the denominator

• Every time

• Most of the time

• Some of the time

• Rarely did I get this correct

Poll

I know how to enter trigonometry expressions in the calculator to find the missing side

• Every time

• Most of the time

• Some of the time

• Rarely did I get this correct