How can I find the third vertex of a triangle when I already have two and equilateral?

How can I find the third vertex of a triangle when I already have two and equilateral? (triangle) ABC is equilateral with vertices A (5,3) and B (10.8). Locate the vertex C.

graphic use. Locate the vetices given. The distance between the two give the side of the triangle. Now, the triangle is equilateral. Therefore, locate the third point. Take an angle of 60 degrees of each vertex of drawing line segment. The intersection of the two will give the third vertex.

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