in the figure if ab is diameter and angle ADC is equal to 120 degree find angle C A B
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in cyclic quad,abcd
adc +b equal to 180. supplementary
120 +b eq 180
b eq to 80
in triangle abc
acb is 90. as angle in semicicle
cab plus acb plus b =180. angle sun property
cab plus 90 plus 80 =180
so cab is 10
adc +b equal to 180. supplementary
120 +b eq 180
b eq to 80
in triangle abc
acb is 90. as angle in semicicle
cab plus acb plus b =180. angle sun property
cab plus 90 plus 80 =180
so cab is 10
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