1. Literacy Research Memory Skill Practice Stretch!
Sine Tangent Cosine Hypotenuse
Why do we use three figures for bearings?
Learn the sine rule
a = b = c
sin A sin B sin C
and cosine rule
a2 = b2 + c2 – 2bc cosA
Skill Practice
Stretch!
Two ships leave a port at 13:00.
Ship A travels on a bearing of 075° at a speed of 12 km/h
Ship B travels on a bearing of 110° at a speed of 30 km/h.
How far apart are the ships at 15:30?
What is the bearing of ship A from ship B?
1. Find y
5 cm
120°
7 cm y
3. Find y
2. Find y
50° y
60°
8 cm
9 cm
10 cm y
11 cm