The chord of a circle is equal to its radius. The angle subtended by this chord at the minor arc of the circle is

In the given figure, if chords $AB$ and $CD$ of the circle intersect each other at right angles, then $x+y=$

In the given figure, if $\angle ABC=45°$, then $\angle AOC=$

In the given figure, chords $AD$ and $BC$ intersect each other at right angles at a point $P$.  If $\angle DAB=35°$, then $\angle ADC=$