Interactive macro-enabled MS-Excel spreadsheet. Contents: Find the equation of a straight-line given the ratio of x : y or y : x. Find the equation of a straight-line through 2 points graphically. Find the equation of a straight-line through 2 points algebraically. Find the equation of a straight-line through 4 points algebraically. Find the equation of a line of symmetry of a quadrilateral & its area. Find the area of a triangle enclosed by three straight-lines. Find the area of a quadrilateral enclosed by four straight-lines. Find the equation of a line through a point parallel to another. Find the equation of a line through a point perpendicular to another. Find the equation of a line through a vertex of a triangle ⊥ to a base. Find the equation of the diagonal of a rectangle given its ratio l : w. Find point of intersection P & area A of a Δ enclosed by three lines. Find point P given a straight-line it lies on & its distance from O.
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