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The operation process of drawing a circle with known radius and length using geometric sketchpad

王林

Apr 17, 2024 pm 12:37 PM

Method 1 Use a line segment with a length of 4 cm to draw a circle

Draw a line segment with a length of 4 cm. Open the geometric sketchpad, use the point tool to draw point A in the blank area, select point A, execute the [Transform] - [Translation] command, set the angle to 0 and the distance to 4 cm in the pop-up dialog box, click [OK], This gives us point A'. Select points A and A', execute the [Construction] - [Line Segment] command, and you will get the line segment AA' with a length of 4 cm.

The operation process of drawing a circle with known radius and length using geometric sketchpad

Draw a circle with a radius of 4 cm. Draw point O in the blank area of the drawing board, select point O and line segment AA’, and execute [Construction] - [Draw a circle with center and radius], so that a circle with a radius of 4 cm is drawn.

The operation process of drawing a circle with known radius and length using geometric sketchpad

Method 2 uses the geometric sketchpad parameter function to draw a circle

Open the geometric sketchpad, execute the [Data]-[New Parameter] command, and enter the value in the pop-up dialog box 4. The unit is none, click [OK], and a new parameter t with a parameter value of 4 will be created.

The operation process of drawing a circle with known radius and length using geometric sketchpad

Mark the distance for parameter t. Select the newly created parameter t and execute the [Transform]-[Mark Distance] command. The operation is as shown in the figure.

The operation process of drawing a circle with known radius and length using geometric sketchpad

Use the point tool to draw any point O, select point O and parameter t, and execute [Construction] - [Draw a circle with center and radius], so that a circle with a radius of 4 cm will be Done.

The operation process of drawing a circle with known radius and length using geometric sketchpad

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