For ΔABC, if ∠ABE and ∠CAD are exterior angles and their measures are 100 and 125 respectively, then find m∠ACB.
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The sum of the exterior angles is 360°.
<ACF = 360° - (100°+125°) = 135°
m∠ACB = 180° - 135° = 45°
<ACF = 360° - (100°+125°) = 135°
m∠ACB = 180° - 135° = 45°
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