There are 100 centimetres in one metre. Therefore, 9 centimetres is equal to 9/100 metres, or 0.09 metres.
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If you're talking about a five sided figure, just add up your figures.
The area of a rectangle of sides 9cm and 10cm is:9cm x 10cm = 90cm2This is equivalent to 0.009m2
9cm x 10 = 90mm
9cm is longer because 86mm is equal to 8.6cm.
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