1. (i) Opposite side (ii) Adjacent side (iii) Hypotenuse
a.
q
r
p
b.
b
c
a
c.
c
a
b
d.
AC
AB
BC
e.
PR
PQ
QR
f.
GE
EF
FG

 

2. Evaluate the following trigonometric ratios and round them to 4 significant figures, where appropriate:
a.
sin 54° = 0.8090
g.
sin 45° = 0.7071
b.
cos 42° = 0.7431
h.
cos 45° = 0.7071
c.
tan 61° = 1.804
i.
tan 45° = 1
d.
sin 12° = 0.2079
j.
sin 60° = 0.8660
e.
cos 78° = 0.2079
k.
cos 60° = 0.5
f.
tan 89° = 57.29
l.
sin 30° = 0.5

3. a.

x
30°
45°
60°
90°
120°
135°
150°
180°
sine x
0
0.5
0.7071
0.866
1
0.866
0.7071
0.5
0
cosine x
1
0.866
0.7071
0.5
0
-0.5
-0.7071
-0.866
-1

b.