Circle Equations Formulas Calculator

Math Geometry

Solving for circle area.

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Select an equation to solve for a different unknown

Circle

	diameter
	radius

	circumference
	radius

	circumference
	diameter

	circumference
	area

	area
	radius

	area
	diameter

	area
	circumference
	radius

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Segment of a Circle

	chord length
	circle radius
	circle center to chord midpoint distance

	segment area
	circle radius

	central angle
	arc length
	circle radius

	segment height
	circle radius
	circle center to chord midpoint distance

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Sector of a Circle

	sector area
	circle radius
	central angle

---

Arc of a Circle

	arc length
	circle radius
	central angle

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