The altitude AD of a ΔABC, in which ∠A is an obtuse angle has length 10cm. If BD =10cm and CD =10√3 cm, determine ∠A.
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Apply tan A in both triangles ADB and ADC
u would get angle ADB=45 and angle ADC=60
ANGLE A =60+45=105 degree
u would get angle ADB=45 and angle ADC=60
ANGLE A =60+45=105 degree
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