(1), OP is the waist, and o is the vertex.
Draw a circle with O as the center, the length of OP as the radius, and the intersection line A as two points.
Two isosceles triangles can be obtained by connecting p and these two points respectively.
(2), OP is the waist and P is the vertex.
Draw a circle with P as the center and the length of PO as the radius. It intersects with the straight line A at one point, and the other point is the O point.
Connect p with this point to get an isosceles triangle.
(3), OP is the bottom.
Perpendicular bisector, who is the line segment OP, intersects with the straight line A at a point, and connects this point with the point P to obtain an isosceles triangle.
There are at most four such triangles.
Depending on the angle, there may be overlap.
When the angle between OP and straight line A is 60 degrees, or 90 degrees, there are only two.
If it is arbitrary, it is two or four.
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(1) What professors are there in Fuzhou University?
I am a material science and engineering major in Fuzhou University. If there are professors who want to skip