: Diameter = 30 cm
Length of chord = 15 cm
Radius = 15 cm [r = 0.5 x diameter]
Since the radius is equal to the length of the chord
Hence the formed triangle in the circle is an equilateral triangle.
θ = 60°
We know that l = r × θ
l = 15 x 60 x π/180 = 5 x π = 5 x 3.14 = 15.7
Therefore, the length of the minor arc is 15.7 cm