Detailed steps for filling the crescent shape with color in Geometric Sketchpad

Step 1 Construct two arcs with common endpoints and form a crescent shape.

Step 2 Construct the points of the two arcs respectively. Use the [Move Arrow Tool] to select the two arcs respectively, click the [Construction] menu in the upper menu bar, and select [On Arc] in its drop-down menu. Point] command,

In this way, points A and B are constructed on two arcs respectively. The specific effect is as shown in the figure.

Step 3 Connect points AB to form a line segment and trace the line segment. Select the [Line Segment Ruler Tool] to connect points A and B to obtain line segment AB. Select line segment AB, click the [Display] menu above, and select the [Trace Line Segment] command from its drop-down menu, as shown in the figure below.

Note: If it is a concave curve, directly set [Tracking Line Segment], and then manually [Fill] to prevent the line segment from filling outside the graph; if it is a convex curve, you can first Set the endpoints to animation, and then perform automatic filling in [Tracing Line Segments] to save effort.

Step 4 Select [Move Arrow Tool], use the mouse to select the endpoint of the line segment and drag the selected line segment back and forth. Drag a few times to complete [Fill]. Be careful to adjust the position of the endpoints so that the line segment does not run outside the crescent diagram.

Step 5 Hide the unnecessary parts to complete the production. You can also set different colors as needed. Select line segment AB, right-click and select [Color] to modify the fill color.

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