Perimeter Calculator

Calculate the perimeter of common shapes: square, rectangle, triangle, circle, and more.

📏 Perimeter Calculator

Side (a)

P = 4a

Length (l)

Width (w)

P = 2(l + w)

Side a

Side b

Side c

P = a + b + c

Radius (r)

C = 2πr

Base (a)

Side (b)

P = 2(a + b)

perimeter circumference square rectangle triangle circle parallelogram geometry math

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