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WAEC Mathematics 2011 Paper

Question : 9

Total: 47

Solution:

Concept:

Bearings are measured clockwise from north.

A compass direction like

S\,20^\circ W

can be converted into a bearing to make the calculation easier.

Explanation:

South is at a bearing of

180^\circ

Facing

20^\circ

west of south means the bearing is

180^\circ + 20^\circ = 200^\circ

Esther turns

90^\circ

clockwise, so add

90^\circ

to her bearing.

New bearing

= 200^\circ + 90^\circ = 290^\circ

A bearing of

290^\circ

70^\circ

west of north.

This direction is written as

N\,70^\circ W

Answer:

N\,70^\circ W

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