는 거 맞다

that's right, isn't it?

Checks a belief you already hold — the everyday way to confirm directions, an order, or a fact: 어? 이거 직진이면 이리로 가는 거 맞아? 'if we're going straight, this is the way, right?', 지금 라이언 님은 한국에 살고 계시는 거 맞나요? Because it asks for confirmation rather than information, it expects a yes. ㄴ 거 맞다 is the same thing about something already completed.

Register: the 맞나요 form is politely careful