Calculators · Geometry and mensuration
Circle, arc and sector
From the radius, the circumference or the area, find the rest; and arcs, sectors and segments from an angle.
r = 7, C = 44, A = 154
The working
- Diameter d = 2r = 14.
- Circumference C = 222/7r = 2 × 3.1429 × 7 = 44.
- Area A = 22/7r² = 3.1429 × 7² = 154.