notes
Conversion of units:
Based on the conversion of units for lengths, studied earlier, the units of areas can also be converted:
 Kilometres, metres, centimetres, millimetres are units of length.
 10 millimetres = 1 centimetre
 100 centimetres = 1 metre
 1000 metres = 1 kilometre

Unit Conversion 1 cm^{2} 100 mm^{2} 1 m^{2} 10,000 cm^{2} 1 ha 10,000 m^{2}
Convert the following:
(i) 50 cm^{2} in mm^{2}
⇒ 1 cm^{2} = 100 mm^{2}
∴ 50 cm^{2} in mm^{2 }= 100 x 50 = 5000 mm^{2}
(ii) 2 ha in m^{2}
⇒ 1 hectare = 10000 m^{2}
∴ 2 ha in m^{2 }= 2 x 10000 = 20,000 m^{2}.
(iii) 10 m^{2} in cm^{2}
⇒ 1 m^{2 }= 10,000 cm^{2}
∴ 10 m^{2} in cm^{2 }= 10 x 10,000 = 100,000 cm^{2}.
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