Two locations, C and D, are marked on the map. The bearing from C to D is 047°. Work out the straight-line distance between C and D. Give your answer to 3 s.f.

Step 1: Measure the straight-line distance between points C and D on the map using a ruler.

Measured map distance = 3.8 cm

Step 2: The map scale is $1 \;cm \to 3 \;\mathrm{km}$.

Actual distance $d =$ map distance $\times 3 \;\mathrm{km/cm}$

$d = 3.8 \times 3 = 11.4 \;\mathrm{km}$

Step 3: Give the answer to 3 significant figures.

$11.4$ has 3 significant figures and includes units.

11.4 km

11.4 km