Let AB be a chord of a circle with centre O. Let C be a point on the circle such that ∠ABC = 30° and O lies inside the triang

Let AB be a chord of a circle with centre O. Let C be a point on the circle such that ∠ABC = 30° and O lies inside the triangle ABC. Let D be a point on AB such that ∠DCO = ∠OCB = 20°. Find the measure of ∠CDO in degrees.

Let AB be a chord of a circle with centre O. Let C be a point on the circle such that ∠ABC = 30° and O lies inside the triangle ABC.

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