Area and perimeter
Area and perimeter of plane shapes: circle, triangles, quadrilaterals, polygons, ellipse and land plots.
Pick a shape. Each calculator computes area and perimeter, draws the shape and shows the formulas.
Circle
Area and circumference of a circle from radius or diameter.
Open calculatorTriangle
Area and perimeter of a general triangle.
Open calculatorRight triangle
Area and perimeter of a right triangle.
Open calculatorEquilateral triangle
Area and perimeter of an equilateral triangle.
Open calculatorIsosceles triangle
Area and perimeter of an isosceles triangle.
Open calculatorSquare
Area and perimeter of a square.
Open calculatorRectangle
Area and perimeter of a rectangle.
Open calculatorRhombus
Area and perimeter of a rhombus.
Open calculatorParallelogram
Area and perimeter of a parallelogram.
Open calculatorTrapezoid
Area and perimeter of a trapezoid.
Open calculatorRegular pentagon
Area and perimeter of a regular pentagon.
Open calculatorRegular hexagon
Area and perimeter of a regular hexagon.
Open calculatorRegular polygon
Area and perimeter of a regular n-gon.
Open calculatorPythagorean theorem
Find the missing side of a right triangle.
Open calculatorAnnulus (ring)
Area and perimeter of an annulus (ring).
Open calculatorCircular sector
Area and arc length of a circular sector.
Open calculatorCircular segment
Area and chord of a circular segment.
Open calculatorEllipse
Area and approximate perimeter of an ellipse.
Open calculatorKite (deltoid)
Area and perimeter of a kite.
Open calculatorLand area from coordinates
Area and perimeter of an irregular plot from vertex coordinates (shoelace formula).
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