A ladder leaning against a wall makes an angle of 45º with the ground. If the length of the ladder is 20 feet, find the approximate distance of the foot of the ladder from the wall.
A.
20 feet
B.
16.6 feet
C.
14.14 feet
D.
10 feet

In a right triangle, if the hypotenuse is equal to 16 feet and the side adjacent to ∠θ is equal to 5 feet, what is the approximate measurement of ∠θ?

A.
18°

B.
75°

C.
15°

D.
72°

In a right triangle, if ∠θ =53° and the side opposite to ∠θ is equal to 2.3 meters, what is the approximate length of the hypotenuse?

A.
1.8 meters

B.
2.9 meters

C.
3.8 meters

D.
0.3 meters

What is the value of arcsin (-0.18)? Use a calculator to determine the answer.

A.
-0.18

B.
-0.75

C.
1.39

D.
0.18

Imagine you are standing 20 feet away from a tree that is 80 feet tall.
The angle that your feet make with the top of the tree is
°____.

What is the expanded equivalent of sin(a + b)?

A.
sin a cos b – cos a sin b

B.
sin a cos b + cos a sin b

C.
cos a cos b – sin a sin b

D.
cos a cos b + sin a sin b

Which expression is equivalent to sin(1.8x) sin(0.5x)?

A.
0.5[sin(2.3x) + sin(1.3x)]

B.
0.5[sin(2.3x) − sin(1.3x)]

C.
0.5[cos(1.3x) − cos(2.3x)]

D.
0.5[cos(2.3x) − cos(1.3x)]