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3 cards from this section. Quick, good the night before a test.
What is the formula for sine?
Think about the sides of a right triangle.
What is the cosine of 0°?
Recall the definition of cosine.
What is the value of sin 30°?
Look at the standard angle values.
True or False: Cosine is the ratio of the adjacent side to the hypotenuse.
Recall the definition of cosine.
A ladder is leaning against a wall. The foot of the ladder is 6 feet from the wall, and the ladder is 10 feet long. Calculate the angle θ where the ladder touches the wall.
Use the cosine ratio and apply the inverse cosine.
A ship is sailing at an angle of 30° to the shore. If the distance from the shore is 100 meters, find the height of the ship above the sea level.
Visualize the situation as a right triangle with the height as the opposite side.
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