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The two vertices of and equilateral triangle are (0, 0) and (2, 2).

The difference of coordinates of the third vertex is

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The coordinates of three consecutive vertices of a parallelogram ABCD are A(1, 3), B(-1, 2) and C(3, 5).

What is the equation of the diagonal BD?

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The coordinates of three consecutive vertices of a parallelogram ABCD are A(1, 3), B(-1, 2) and C(3, 5).

What is the area of the parallelogram?

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The equations of the sides AB, BC and CA of a triangle ABC are x - 2 = 0, y + 1 = 0 and x + 2y - 4 = 0 respectively.

What is the equation of the altitude through B on AC?