Skyhawk 172/Cutlass 172
Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 90; Flight Crew Total 525; Flight Crew Type 470
Conflict NMAC
Flight Crew Took Evasive Action
Human Factors
Entering left downwind for RWY XX at ZZZ noticed Aircraft Y also on downwind for RWY XX. Prior to this; we announced our position and intention to enter RWY XX downwind on CTAF. Aircraft Y made a takeoff call on CTAF and took off from RWY XX as we were approximately 4 miles from entering downwind for RWY XX. Aircraft Y made no further radio calls until after we announced our position on the downwind leg. After our downwind call; Aircraft Y also announced that he was on downwind for RWY XX. This is when I saw that he was co-altitude and approximately 500 feet to the left of my aircraft. At this point I maneuvered to maintain safe spacing between our aircraft.
Cessna-172 pilot reported an NMAC event in VFR landing pattern with trailing aircraft .