Exterior Angle Theorem For a triangle The exterior angle d equals the angles b plus c. (d = b + c) The exterior angle d is greater than angle b and angle c. (do > bo, do > co) Proof d = b + c : a + b + c = 180° (Because the interior angles of … Continue reading "Exterior Angle Theorem"

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Posted: August 22, 2019 Under: Geometry By Sigma No Comments