If the line passing through the origin and the ellipse * * are the left focus of the ellipse, then the maximum area of the triangle ABF is If f (- C, 0) is the left focus of the ellipse, then the maximum area of the triangle ABF is A. The square of BC B, AB C, AC D, B

If the line passing through the origin and the ellipse * * are the left focus of the ellipse, then the maximum area of the triangle ABF is If f (- C, 0) is the left focus of the ellipse, then the maximum area of the triangle ABF is A. The square of BC B, AB C, AC D, B

The area of a triangle is equal to the sum of the areas of two triangles whose base is of and whose fixed points are a and B. that is to say, the area of a triangle is the largest when the base is fixed and the projection of AB on the y-axis is the largest. Needless to say, the rest is the extremum problem of height