Contiguous 2 lines

how to make circle contiguous of 2 lines?

Yes, using command Circle and tangent option
Snag_1a4ae84e

Circle
“Center of circle”. Select Tangent option.
“First tangent curve” Select first curve .
“Second tangent curve or radius” Select second curve.
“Third tangent curve. Press enter to draw curve from first two points.” Select Radius option.
Type desired radius.
Enter.

Thanks very much