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Inscribed angle HTML5


In a circle, the measure of an inscribed angle is half the measure of the central angle with the same intercepted arc.

Click on "arcs" to display the intercepted arcs.

Click and drag the points A, B and C around the circle.

Click on the protractor to use it.

Learning goals

  • To show the difference between central angle and inscribed angle.
  • To show that the measure of angle AOB is twice the measure of angle ACB if they intercept the same arc.