What do you call shaded part?
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You cannot have a shaded area of 4 cm since area cannot be measured in centimetres.
Either directly or by finding the area of the whole and subtracting the area of the non-shaded part.
This question needs additional information, To get the area of the shaded area get the difference between the total area and the un-shaded region.
The area of the shaded sector is: 245.7 square units.
Well, honey, the area of a shaded region is simply the difference between the total area and the area of the unshaded parts. Just calculate the area of the entire shape and subtract the areas of any parts that aren't shaded. It's basic math, darling, nothing to lose sleep over.