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Inscribed and Central Angles in GeoGebra

You can use GeoGebra to draw inscribed and central angles.

GeoGebra Instruction 1

Open Algebra View and Graphics View under GeoGebra icon View in GeoGebra icon Menu.
Draw a circle in GeoGebra by following GeoGebra Instruction 1 from this entry. You should get a circle with center A, and a point B located on your circle.
Select the Point on Object GeoGebra icon tool to draw a point on the circle. You should get a another point C.
Next, you need to draw the central angle subtended by the arc BC. Select Angle GeoGebra icon, and click B, A and C, in that order.
Then, you draw an inscribed angle subtended by the arc BC. Draw a point on your circle which is not on the arc BC using Point on Object GeoGebra icon as in Step 2. Select Angle GeoGebra icon again, and click B—the point you just drew—and C, in that order.

Think About This

Draw a couple more inscribed angles. You’ll see that every inscribed angle subtended by the arc BC will always be half of the central angle!

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