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Radii, Chord, Diameter and Circumference of the Circle

In the figure...

Question

In the figure, seg AB is a diameter. Write the names of the right angles.

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Solution

We know that an angle in a semicircle is a right angle.
It is given that AB is a diameter. Then, ∠APB and ∠AQB are angles in a semicircle.
∴ ∠APB and ∠AQB are right angles.

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