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Infographic Geometry Problem 1055: Triangle,
Altitude, Perpendicular, Area, Circumradius, Circle. Level: High School, SAT Prep, College, Mathematics Education
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In a triangle ABC, R is the circumradius and
BF is the altitude (see the figure below). FE and FD are perpendicular
to AB and BC at E and D, respectively. If DE = d, prove that area of
triangle ABC = R.d
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