Open the geometry artboard, click the [Ruler] tool on the toolbox, hold down the [shift] key, draw a horizontal line segment in the operation area, select the [Text] tool on the toolbox, when the cursor changes from a [little white hand] to a [little black hand], click on the two endpoints of the line segment respectively to display A and B, and get the line segment AB.
Click the [Select Arrow] tool on the toolbox, select an end point and line segment in the middle line segment, and click the [Construct] – [Perpendicular Line] command to draw the perpendicular line of the line segment AB.
Click the [Point] tool on the toolbox, move the cursor to the vertical line, when the vertical line shows high brightness, click the left mouse button to get a point, select the [Select Arrow] tool on the toolbox, select the point A and B points you just made, and click the [Construct] – [Angular Bisector] menu command to make the angular bisector.
Click the [Select Arrow] tool on the toolbox, select point B and the angular bisector you just made, and click the [Construct] – [Perpendicular] menu command to draw the perpendicular line of the angular bisector.
Click the [Point] tool on the toolbox, move the cursor to the perpendicular line J and L, and click the left mouse button when the brightness is high, and get a point, which is the intersection of the perpendicular line J and L, as shown in the figure. Click the Text tool on the toolbox and name it C.
Click the [Select Arrow] tool on the toolbox, click the empty space of the operation area to release all the selected objects, then select the points and angular bisectors on the vertical lines j, l, and line segment AC, and click the [Display] – [Hide Object] menu command to hide the selected objects. Then select points C and A, press the shortcut key [ctrl+L], draw the line segment CA, and click the blank space in the operation area to release the selected object. In the same way, make a line segment CB to obtain an isosceles right triangle, as shown in the figure.
Click the [File] – [Save] menu command. (The three vertices of the triangle can be pulled arbitrarily, and the characteristics of the isosceles right triangle remain unchanged).
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