No.
1 acre is 43560 sq ft (regardless of the shape).
As a square this is approx 208.71 ft x 208.71 ft
An acre was probably derived from a rectangular area 1 furlong long by 1 chain wide = 660 ft x 66 ft.
As it is a measure of area it does not matter what shape the area is. It could be a circle, a rectangle, square, octagon, L shaped hexagon, etc.
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An acre is 43,560 square feet, so an area 100 feet x 100 feet (10,000 square feet) is about 0.23 of an acre, less than a quarter acre.
43,560 square feet = 1 acre 125-ft x 17-ft = 2,125 square feet = 0.049 acre (rounded) 125-ft x 170-ft = 21,250 square feet = 0.488 acre (rounded)
1 acre = 43,560 square feet80-ft x 1,000-ft = 80,000 square feet = 1.8365 acres = 183.65% of an acre (rounded)
.688 acre. 100 x 200 /43,560= .68870
There are 43,560 square feet in one acre. 65 x 165 =10,725 square feet, so about 1/4 of an acre.