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Calculate area and perimeter for rectangles, circles, triangles, and squares
Select a shape and enter dimensions to calculate area
rectangle
square
circle
triangle
Area = length × width
Perimeter = 2 × (length + width)
Area = π × radius²
Circumference = 2 × π × radius
Area = side²
Perimeter = 4 × side
Area = (base × height) ÷ 2
Perimeter = sum of all sides