9cm is longer because 86mm is equal to 8.6cm.
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If you are talking about 9cm, 9cm and 1cm then yes it can form a triangle because this would be an isosceles triangle. The two longer sides add up to longer than the short side so it can be a triangle.
Divide by 10.
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