posted by lucy .
the apothem of a square candle is 5cm,the side length is 10cm,the height is 9cm, what is its volume ?
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The apothem of a regular polygon is the distance from the centre of the polygon to one its sides.
I will assume that by "square candle" you mean its base is a square.
If its apothem is 5 then its side is 10.
So the fact that the side is given as 10 confirms that and is actually redundant information.
Volume = 10cm x 10cm x 9cm = 900 cm^3