The figure shows the $P-V$ plot of an ideal gas taken through a cycle $ABCDA$. The part $ABC$ is a semi-circle and $CDA$ is half of an ellipse. Then 

The process during the path $A\to B$ is isothermal 

Heat flows out of the gas during then path $B\to C\to D$

Work done during the path $A\to B\to C$ is zero

Positive work is done by the gas in the cycle $ABCDA$