Software TutorialComputer SoftwareTutorial on drawing a 120-degree fan shape on geometric sketchpad
Open the geometric sketchpad, select the [Circle Tool] from the toolbox on the left, draw any circle on the canvas, the center of the circle is O, pick any point on the circle, and call this point C.
Use the [Move Arrow Tool] to select points O and C, and execute the [Measure]-[Distance] command to measure the distance of OC; select the distance data between points C and OC, and execute [ Construction] - [Draw a circle with center and radius], construct a circle with point C as the center and OC as the radius.
Set the intersection points of the two circles as A and B, select points O, B, and A in sequence, execute [Construction]-[Arc], and you will get arc AB. Select the arc and Execute [Measurement] - [Radians], and you will get that the angle of arc AB is 120°.
Use the line segment tool to connect OA and OB, hide the redundant objects, and you will get a 120° fan shape as shown in the picture.
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