Using Trig Ratios to Find Missing Sides and Angles
Recall / Warm-Up
In the right triangle below, angle . If you know the hypotenuse and want to find the side opposite angle , which trig ratio should you use?
Cosine
Tangent
Sine
It doesn't matter — any ratio will work
Which equation correctly defines in a right triangle?
A right triangle has legs 3 and 4 and hypotenuse 5. Angle is the angle opposite the side of length 3.
What is ? Enter your answer as a fraction or decimal.
Fluency Practice
In a right triangle, angle and the side adjacent to measures 15. To find the side opposite , which equation is correct?
A right triangle has angle and hypotenuse . Find the length of the side opposite angle . Round to the nearest hundredth.
A right triangle has angle and the side adjacent to measures 10. Find the hypotenuse.
A right triangle has angle and the side opposite to measures 9. Find the adjacent side.
In a right triangle, the side opposite angle measures 8 and the hypotenuse is 17. Use the inverse sine function to find angle to the nearest degree.
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