Homework Help: GEOMETRY

Posted by HELP PLS MARVELOUS on Wednesday, January 9, 2013 at 8:04am.

ABCD is an inscribed quadrilateral. AD, BC are produced to meet at X. If angle B= 80 degrees and angle X= 30 degrees, find angle XCD.

GEOMETRY - Reiny, Wednesday, January 9, 2013 at 8:47am
I will assume you mean "inscribed in a circle"
In a cyclic quadrilateral, the opposite angles are supplementary, so angle D = 100°
Also angle ADC is an exterior angle in triangle DCX, so
angle DCX + angle CXD = angle ADC
angle DCX + 30 = 100
angle DCX = 70°
GEOMETRY - Anonymous, Friday, January 11, 2013 at 1:39am
30

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