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Harcourt Social Studies Homework and Practice Book Student Edition Grade 4 States and Regions Book D
Harcourt's theorem is a formula in geometry for the area of a triangle , as a function of its side lengths and the perpendicular distances of its vertices from an arbitrary line tangent to its incircle. The theorem is named after J. Harcourt, an Irish professor. Let a triangle be given with vertices A , B , and C , opposite sides of lengths a , b , and c , area K , and a line that is tangent to the triangle's incircle at any point on that circle. Denote the signed perpendicular distances of the vertices from the line as a ', b ', and c ', with a distance being negative if and only if the vertex is on the opposite side of the line from the incenter. If the tangent line contains one of the sides of the triangle, then two of the distances are zero and the formula collapses to the familiar formula that twice the area of a triangle is a base the coinciding triangle side times the altitude from that base.
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