First, find the perimeter of the circle p = 2 × π × r p = 2 × 3,14 × 19 p = 119.32 The perimeter of the circle is 119.32 cm
Second, find the central angle Comparison of the central angle, full rotation angle, the arc, and the perimeter can be written as angle/(full rotation angle) = arc/perimeter angle = arc/perimeter × (full rotation angle)
