Arcs of a circle

All in One Place

Everything you need for JC, LC, and college level maths and science classes.

Learn with Ease

We’ve mastered the national curriculum so that you can revise with confidence.

Instant Help

24/7 access to the best tips, walkthroughs, and practice exercises available.

  1. Terms related to circles
    • Radius
    • Diameter
    • Circumference
    • Central angle
      • minor arc
      • major arc
    • Inscribed angle
    • Chord
      • perpendicular bisector
    • Tangent
      • point of tangency
  2. How to find the length of an arc?
    • by Central angle
    • by Proportion
    • by Using formula a = Θr

  1. Find the length of the arc in red.

    1. Finding arcs of a circle given radius and angle

    2. Calculate the arc length using the given angle and diameter

    3. Relationship among arcs of a circle, angle, and radius
  2. In the following circle, AD is diameter and BC ⊥ \bot EF, and the radius is 7. Find the measures of:
    Arcs of a circle
    1. arcAB arc AB
    2. arcABE arc ABE
    3. arcAEC arc AEC
    4. ∠BFD \angle BFD
  3. On circle D, arcAB= 105°, arcBC= 140° and arcABC= 245°. Point E is on the circle D too and arcCE= 145°. Explain what E must be on ArcAB.
    Topic Notes