1.

In the given figure (not drawn to scale), DO and CO are the bisectors of \[\angle ADC\] and \[\angle BCD\]respectively. If \[\angle ADC=\angle BCD=60{}^\circ \] and \[\angle DAB=100{}^\circ \], find the measure of \[\angle DOC\] and \[\angle ABC\]respectively,

A. \[100{}^\circ \], \[160{}^\circ \]
B. \[\text{110 }\!\!{}^\circ\!\!\text{ }\], \[150{}^\circ \]
C. \[120{}^\circ \], \[140{}^\circ \]
D. \[\text{110 }\!\!{}^\circ\!\!\text{ }\], \[130{}^\circ \]
Answer» D. \[\text{110 }\!\!{}^\circ\!\!\text{ }\], \[130{}^\circ \]


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