Mathematics for IGCSE & O level - Geometrical Terms (Section 6 - No. 2)
What information is needed to find the circumference of a circle, given an arc length and its corresponding central angle?
Radius and diameter
The total angle of the circle (360 degrees)
Only the arc length
The center point of the circle
Explication
To find the circumference, you use a proportion relating the arc length, the central angle, and the total angle of a circle (360 degrees).