A C M 5 2 4. If C = 20º, then cos C is equal to: A. sin 70 B. cos 70 C. tan 70.

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Presentation transcript:

A C M If C = 20º, then cos C is equal to: A. sin 70 B. cos 70 C. tan 70

Skills Check

Using Trig to Find Missing Angles and Missing Sides

Finding a missing angle. Steps: 1) Where is the missing angle? 2) Identify the sides as H, O, or A 3) What Trig ratio is this? 4) Find the inverse trig function button on your calculator 5) Plug ratio in, hit enter

Ex: 1 Figure out which ratio to use. Find x. Round to the nearest tenth. 20 m 40 m Shrink yourself down and stand where the angle is. Identify the given sides as H, O, or A. x A O What trig ratio is this?

Ex: 2Figure out which ratio to use. Find x. Round to the nearest tenth. 15 m 50 m x Shrink yourself down and stand where the angle is. Identify the given sides as H, O, or A. H O What trig ratio is this?

Ex. 3: Find . Round to the nearest degree A O

Ex. 4: Find . Round to the nearest degree H A

Ex. 5: Find . Round to the nearest degree H O

Finding a missing side. Steps: 1) Identify the given angle 2) Identify the sides as H, O, or A 3) What Trig ratio is this? 4) Set ratio equal to trig angle then solve for x 5) Use sin,cos,tan button on calculator

Ex: 6Figure out which ratio to use. Find x. Round to the nearest tenth. 20 m x O A

Ex: 7 Find the missing side. Round to the nearest tenth. 80 ft x O A

Ex: 8 Find the missing side. Round to the nearest tenth. 283 m x H O

Ex: 9 Find the missing side. Round to the nearest tenth. 20 ft x A H

When we are trying to find a side we use sin, cos, or tan. When we are trying to find an angle we use ( INVERSE ) sin -1, cos -1, or tan -1.