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In right triangle ACD shown below, B lies on side AC.  Some angle measures are given.  What is the measure of BDC?

 

 Mar 21, 2021
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Since the angles in a triangle add up to 180 degrees, angle ADC is 180-30-90=60. Since BDC = ADC - ADB, BDC = 60-25=35

 Mar 21, 2021

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