Basic Trigonometry Review

Trigonometry Review

Three Trig Ratios

•  $\sin\theta=\frac{opp}{hyp}$  

•  $\cos\theta=\frac{adj}{hyp}$  

•  $\tan\theta=\frac{opp}{adj}$  

• Identify the hypotenuse first (across from right angle)

• Label opposite and adjacent based on the angle of reference

Multiple Choice

Find sinX.

• A
• B
• C
• D

Multiple Choice

Which ratio represents the cos(θ)?

• x/y

• x/z

• y/x

• y/z

Using Trig to find Missing Sides

• Label the side of the triangle (hyp, opp, adj)

• Pick a trig ratio (sin, cos, tan) based on what you know and what you want to find

• Write the ratio

• If the variable is on top, multiply; if the variable is on bottom, divide

Multiple Choice

Choose the correct ratio.

• cos(33)=x/14
• sin(33)=x/14
• cos(33)=14/x
• sin(33)=14/x

Multiple Choice

Solve for x

• 4
• 5
• 6
• 7