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P3, optimal design of math problems in Grade Two; 2
A: Because AB+BC = 7 and AC = 8, it is impossible to form a triangle.

B: A circle with B as the center and BC=3 as the radius has two intersections with ray AC and can be made into two triangles.

C: Let A and B be vertices respectively. Let ∠A=60? ,∠B=45? Two rays intersect at one point to form a unique triangle.

D: Make a circle with a diameter of AB=6, and choose any point C on the circle except A and B to make countless triangles.