Question 4
Example 13. The diagram shows a quadrilateral $ABCD$, in which $AD=BC$, $\angle CAD=50^\circ$, $\angle ACD=65^\circ$, $\angle ACB=70^\circ$.
What is the measure of $\angle ABC$?
**Editorial input convention:** Enter the angle measure in degrees, as a number only.
What is the measure of $\angle ABC$?
**Editorial input convention:** Enter the angle measure in degrees, as a number only.