10 m
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The area of a rectangle is simply the length times the width. If the length and width are in meters, the area, of course, will be in square meters.
area = length by width. = 21 X 42 =882m2
Area = Length * Width = 6 metres * 5 metres = 30 square metres.
If it's rectangular - which is usually the case for a wall - you simply multiply length x width.
Area = Length * WidthArea = 25 * 10Area = 250 Square Feet