4.2 Scale Drawing

• Compass and true bearings
• Bearing of a point
• Angles of elevation and depression
• Simple surveying

• identify compass and true bearings in real-life situations
• determine the bearing of a point from another point in real-life situations
• locate a point using bearing and distance in real-life situations
• identify angles of elevation in real-life situations
• determine angles of elevation in different situations
• identify angles of depression in real-life situations
• determine angles of depression in different situations
• apply scale drawing in simple surveying
• appreciate the use of scale drawing in real-life situations

“How do we use scale drawing in real life?”

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1. Compass directions
   40 min · 1 practice tasks · quiz
   The eight points of the compass, and the angle each one sits at from north.
2. Compass bearings
   40 min · 1 practice tasks · quiz
   A compass bearing names where you start, how far you turn, and which way.
3. True bearings
   40 min · 1 practice tasks · quiz
   One angle, turned clockwise from north, written with three figures.
4. Changing between the two forms
   40 min · 1 practice tasks · quiz
   A quick sketch turns a compass bearing into a true bearing, and back again.
5. The bearing of one point from another
   40 min · 1 practice tasks · quiz
   Every bearing is taken from somewhere, so each point needs its own north line.
6. Back bearings
   40 min · 1 practice tasks · quiz
   The bearing back is the bearing out, turned half a circle: add 180 or subtract 180.
7. Choosing and using a scale
   40 min · 1 practice tasks · quiz
   A scale says what one drawn centimetre stands for: divide going onto paper, multiply coming off it.
8. Locating a point from a bearing and a distance
   40 min · 1 practice tasks · quiz
   A bearing gives a direction and a distance gives a length; together they fix one point.
9. A journey in several legs
   40 min · 1 practice tasks · quiz
   Draw each leg from where the last one ended, with a fresh north line at every turning point.
10. Angles of elevation
    40 min · 1 practice tasks · quiz
    Looking up at something, the angle between your line of sight and the horizontal.
11. Finding a height by scale drawing
    40 min · 1 practice tasks · quiz
    Draw the measured distance and angle to scale, then measure the height off the drawing.
12. Angles of depression
    40 min · 1 practice tasks · quiz
    Looking down from a height, the angle below the horizontal, and it equals the elevation from below.
13. Finding a distance from an angle of depression
    40 min · 1 practice tasks · quiz
    Draw the height and the angle to scale, and the distance can be measured off.
14. Simple surveying
    40 min · 1 practice tasks · quiz
    One straight baseline and a set of right-angled offsets will map an irregular plot.