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You can use `GeoGebra`

to draw inscribed and central angles.

`GeoGebra`

Instruction 1

- 1.
- Open
`Algebra View`

and`Graphics View`

under`View`

in`Menu`

. - 2.
- 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. - 3.
- Select the
`Point on Object`

tool to draw a point on the circle. You should get a another point`C`

. - 4.
- Next, you need to draw the central angle subtended by the arc
`BC`

. Select`Angle`

, and click`B`

,`A`

and`C`

, in that order. - 5.
- 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`

as in Step 2. Select`Angle`

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!