The right foot (the foot itself, typically below the ankle) of the body.
右足をひねってしまって、歩くのがつらい。
I twisted my right foot and it's painful to walk.
サッカーで相手の右足を蹴ってしまい、反則を取られた。
I accidentally kicked the opponent's right foot in soccer and was penalized.
右足の靴がきつくて靴ずれができた。
The right shoe is tight and caused a blister.
The right leg (the whole leg, e.g., from thigh to ankle); can be synonymous with 右脚 depending on context.
右足の骨を折って入院したため、リハビリが必要だ。
He broke the bones in his right leg and was hospitalized, so he needs rehabilitation.
転んで右脚の筋肉を痛めた。
I fell and injured a muscle in my right leg.