Arc of a Circle
A connected section
of the circumference of a circle.
are measured in two ways: as the measure of the central
or as the length of the arc itself.
Measurement by central angle
The red arc (minor arc) measures
The blue arc (major arc) measures 240°.
Formula: s = rθ
s = arc length
r = radius of the circle
θ = measure of the central angle in radians
Red arc: r = 2 and θ = 2π/3,
so s = 4π/3
Blue arc: r = 2 and θ = 4π/3,
so s = 8π/3
length of a curve