If that's a rectangular block, you have to use the formula for a rectangle, and add all six sides to get the surface area; since opposite sides are equal, you can group them like this: 2 x 9 x 5 + 2 x 9 x 10 + 2 x 5 x 10.
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87.59 = (8 x 10) + (7 x 1) . (5/10) + (9/100)
How about 5 x 9 x enough multiples of 10 to give you 5 digits? 5 x 9 = 45 5 x 9 x 10 = 450 5 x 9 x 10 x 10 = 4500 5 x 9 x 10 x 10 x 10 = 45000 18225
They are in the same ratio 2:9 multiplied by 5 makes 2 x 5 = 10 9 x 5 = 45 so is 10:45
5/7 x 9/10 = 9/14
area of rectangle = base x height = 9 x 10 = 90 square cms