Measuring Angles on a Circle

Instructions
[b]Step 1.  Experiment[br][/b]Use the MOVE tool [icon]/images/ggb/toolbar/mode_move.png[/icon]to drag Point C around the circle and change the size of angle DAC. The angle is colored in yellow.  Experiment a bit.[br][br][b]Step 2. Estimate[br][/b]Use the MOVE tool [icon]/images/ggb/toolbar/mode_move.png[/icon]to turn off the [b]Angle Reporter[/b]. Using estimation skills, try to make the various angles shown in the Report Table below.  After each estimate, turn on the [b]Angle Reporter[/b] and check your estimate.  Record the actual angle measurement in a [i]Report Table[/i].[br][br][i][u]Report Table [/u][/i][br][table][tr][td][u]Target Angle[/u][/td][td]         [u]Actual Angle [/u][/td][/tr][tr][td]45 degrees [/td][td][right]degrees[/right][/td][/tr][tr][td]270 degrees [/td][td][right]degrees[/right][/td][/tr][tr][td]90 degrees [/td][td][right]degrees[/right][/td][/tr][tr][td]225 degrees [/td][td][right]degrees[/right][/td][/tr][tr][td]180 degrees [/td][td][right]degrees[/right][/td][/tr][/table][b][br]Step 3. Play a Game (2 players)[br][/b]With the Angle Reporter turned off, one person sets the angle to any desired size.[br]The other person then estimates the size of the angle in degrees.[br]If the estimate is within 10 degrees above or below the actual measurement, the estimator gets 5 points. [br]If the estimate is within 5 degrees above or below the actual measurement, the estimator gets 10 points.  [br]Taking turns being estimator, play 5 rounds for high score.

Information: Measuring Angles on a Circle