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How to draw a picture on a computer is mathematical geometry.
Draw a line segment MN with a ruler, so that MN=3cm, draw an arc with B as the center and MN as the radius, and connect BC with PA at point C, then ABC is the triangle to be found. There are two points to draw the arc intersection point PA with point B as the center and point MN as the radius, and these two points are consistent with the meaning of the question, so two triangles can be drawn.