CAIE IGCSE Mathematics Extended E4.3.1 Draw & interpret scale drawings.

Practise interpreting scale drawings by linking map measurements with real lengths or areas and giving scales in the required form.

Exam points

convert a map area and real area into matching units before finding a scale 1:n

[Maximum number: 3]

A lake has an area of $3 \mathrm{~km}^{2}$ .
On a map the area of the lake is $18.75 \mathrm{~cm}^{2}$ .
Find the scale of the map in the form 1: n.

40000

B2 for 1 cm to 0.4 km or 2.5 cm to 1 km or 1600000000
or M2 for $\sqrt{\frac{3\times10^k}{18.75}}$ oe where k>5
or M1 for area conversion evidence listed in markscheme

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E4.3.1 Draw and interpret scale drawings. question 1