Calculate · UnitConvert · formulaReference
Circle：Area = πr² | weeklong = 2πr
Triangle：Area = ½bh | Pythagorean theorem = a²+b²=c²
Sphere：Volume = ⁴⁄₃πr³ | tableArea = 4πr²
twoPower：x = (−b ± √(b²−4ac)) / 2a
Arithmetic Sequence：Sₙ = n(a₁+aₙ)/2
Geometric sequence：Sₙ = a₁(1−rⁿ)/(1−r)
fornumber：log(a,b) = ln(b)/ln(a)
log(a,b) = ln(b)/ln(a)
columngroupcombine：C(n,r) = n!/(r!(n−r)!)
C(n,r) = n!/(r!(n−r)!)
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