1. An axisymmetric figure is drawn on the graph 1. You can draw another shaft with a different shape in Figure 2.

2. Draw an isosceles triangle, then an obtuse triangle, and draw a height for them.

3. Strictly speaking, it can be drawn (one vertex is on the point and the other two vertices are not on the point), but it cannot be circled (it is wrong to require an equilateral triangle). The significance of the point diagram here is that it is easy to see the axisymmetric figure.

The function of horizontal and vertical lines is similar to the grid diagram of plane rectangular coordinate system. You can draw it with a protractor and a ruler. A vertex A is on the dot. Measure the point line (vertical line) passing through the dot counterclockwise and clockwise with a protractor to draw two points B and C where two oblique lines intersect with the line connecting the horizontal dot. Then connect the three points to draw an equilateral triangle.