Approximately 7 cm
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(98.6)^2 OR 98.6x98.6=9721.96cm^2
16.8m x 50cm = 16.8m x 0.5m = 16.8 x 0.5 square metres = 8.4 sq metres.
Area = length x width = 3 x 6 = 18 square meters, regardless of the depth Volume = area x depth = 18 x 0.5 = 9 cubic meters
Square root the area. The length and width of a square are always the same and length times width is the area so this is how you get the area.
The size or length of a square is related to its area as the area of a rectangle s the product of the length times the width. As a square is a special type of rectangle, where the length is equal ti the width, the area of a square is the length times the length or length^2, also spoken as "length squared".