Triginometry

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You can find the area of any triangle using:

area = 1/2bcsin A or area = 1/2acsin B or area = 1/2absin C

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Radians, arcs, and sectors

Arc length of sector = radius x central angle

Area of sector = (central angle x radius squared) / 2

To convert degrees to radians, multiply by pi/180

To convert radians to degrees, multiply by 180/pi

Application of right-angled triangle trigonometry

The angle of elevation is the angle 'up' from horizontal

The angle of depression is the angle 'down' from horizontal

The four cardinal compass points are

north (N)

south (S)

east (E)

west (W)

Three-figure bearings give directions as clockwise from north