Pre-Calculus - Eduware

V. TRIGONOMETRY 2. Trigonometry of the Right Angle
A. Sin, Cos, and Tan Functions
1565. In the diagram below, maC = 90º, maA and
CA = 10.
1568. In the accompanying diagram of right triangle ABC, what is
tan C?
Which equation can be used to find AB?
(1) (3)
(2) (4)
1567. A 20-foot ladder is leaning against a wall. The foot of the
ladder makes an angle of 58° with the ground. Find, to the
nearest foot, the vertical distance from the top of the ladder
to the ground.
(1) 2
3
(2) `13
3
(3) 3
2
(4) 2
`13
1571. In the accompanying diagram of right triangle ABC, b = 40
centimeters, maA = 60º, and maC = 90º. Find the number
of centimeters in the length of side c.
17 ft
1569. If tan A = 0.4548, find the measure of aA to the nearest
degree.
24º
80 cm
1572. In the accompanying diagram of right triangle ABC, the
hypotenuse is AB , AC = 3, BC = 4, and AB = 5.
1570. The straight string of a kite makes an angle of elevation
from the ground of 60°. The length of the string is 400 feet.
What is the best approximation of the height of the kite?
(1) 200 ft (3) 300 ft
(2) 250 ft (4) 350 ft
1573. If tan A = 1.3400, find the measure of aA to the nearest
degree.
53º
1575. If tan A = 0.5400, find the measure of aA to the nearest
degree.
28º
Sin B is equal to
(1) sin A (3) tan A
(2) cos A (4) cos B
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