Trim & Extend

Trim
Removes portion of the object at the intersection
Only objects overlapping can be trim

Home tab > Modify panel > Trim

1st select objects: Select the cutting edges

Select the 2 lines as the cutting edges, press Enter

Select the portion to trim

Repeat the command

Select the circle as a cutting edge, press Enter

Select the left portion of the lines

Extend
Extend objects to meet the boundary edge

Home tab > Modify panel > Extend

1st select objects: Select the boundary edges 

Press Enter

Select the objects to extend

Trim & Extend
Use either command to trim & extend

Home tab > Modify panel > Extend

Select all the boundary edges and cutting edges

Press Enter

Extend the 2 lines to the circle

Press & Hold the Shift key

Select the portions to trim