Detailed method of constructing irregular shadows with the help of geometric sketchpad

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1. Use the ruler segment tool to make line segment AB, select line segment AB, click [Construct] - [Midpoint] to get midpoint C, select point C and point A in sequence (note the order), select [Construction]——[Construct a circle using the center of the circle and the points on the circle] to make a circle C.

2. Select point A and point B, select [Construction] - [Construct a circle with the center of the circle and points on the circle] to create circle A.

3. Select point A and line segment AB, select [Construction] - [Perpendicular Line], the perpendicular line intersects circle A at point D, select points A and D, and select [ Construction] - [Line Segment], select the vertical line and press [Ctrl H] to hide it. Select the line segment AD, select [Construction] - [Midpoint] to get the midpoint E, select point E and point A, select [Construction] - [Construct a circle with the center and the points on the circumference] to create a circle E.

4. Select circle E, select points A and D in turn, select [Construction] - [Arc on Circle], select the arc, select [Construction] - [Inside the Arc] 】——[Inside the sector].

5. Select circle A, select points D and B in sequence, use the same method to construct the inside of the fan, select the inside of the fan, right-click, select [Color], and change the color to red.

6. Select circle C, then select points A and B in turn. Use the same method to construct the inside of the fan. Select the inside of the fan, right-click to change the color to white, then right-click to select properties, and then Set the opacity to 100%.

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