In plane geometry, A rectangle is a four-sided flat shape. rectangle's Each internal angle is 90°. Opposite sides of rectangle are parallel and of equal length.

Area = w × L

Perimeter = 2(w+L)

Diagonal "d" = √(w^{2} + L^{2})

For example, When width =2, length = 3, the area = 6, perimeter = 10, diagonal = 3.6056

For example, When width =2, perimeter = 20, the length = 8, area = 16, diagonal = 8.2462

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