Summary Grade 11/12 mapwork notes

MAPWORK

Political map of South Africa




Where does SA lie?

- SOUTH of the equator (22S - 35S)
- EAST of the Greenwich Meridian (16E - 33E)


CO-ORDINATES


1. Measure the length of the block
2. Measure from the start of the block to the point
length to point
3. x 60
length of block
4. Repeat for breadth
5. Remember down, right easy!

, DISTANCE

Straight line distance:
distance x 50 000
= ______km
100 000


distance x 50 000
= _____m
100
Use the same formulas for curve line distance
For curvy line distance use a piece of paper and mark off the straight line
distance then shift the paper to make the next straight line

AREA

Regular area:
d1 x 50 000 d2 x 50 000
A= 𝑥
100 000 100 000
If you want m2 then divide by 100


Irregular area:
1. Draw 0.5cm x 0.5cm grids then count blocks
2. Number of blocks x 0.0625 = ___km2
3. Number of blocks x 62500 = ___m2
OR
1. Measure average length
2. Measure average breadth
3. Put in regular area formula


If you want hectors, then get in m2 and divide by 10 000