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The problem of the largest area of mathematics in grade three. 25 questions in the standard senior high school entrance examination. See the attached topic.
(1) directly connects two diagonals,

(2) Draw a regular triangle. Draw an arc with b and c as the center and BC as the radius, and the intersection of the two arcs in the square is p.

(3) Make a regular triangle with BC as one side and draw the circumscribed circle of the triangle, as shown in the figure.

(Reason: the angles of the circles subtended by the same arc are equal) The circle with the largest area has two intersections with AD, namely point P.

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