AI Math SolverThe area of a circle is πr², where r is the radius. Learn the formula, what each part means, and how to find the area from the radius or diameter.
Solve it with the AI Math SolverA circle's area grows with the square of its radius. The formula A = πr² says: square the distance from the center to the edge, then multiply by π.
The radius runs from the center to the edge; the diameter crosses the whole circle through the center and is twice the radius. Knowing either one is enough to find the area.
The area of a circle is A = πr², where r is the radius. Square the radius and multiply by π (about 3.14159).
If you know the diameter instead, halve it to get the radius (r = d/2), then apply A = πr². You can also write it as A = π(d/2)².