When to use ruler in Korean
Korean: 자[ ja ]

When to use it
A ruler (자) is a straight tool used to draw lines and measure length. Students often use it at school in math or art class. You can also use a ruler at home for simple measuring.
Example sentences
저는 학교에서 자를 써요.
I use a ruler at school.
자로 선을 그으세요.
Draw a line with a ruler.
제 필통에 작은 자가 있어요.
There is a small ruler in my pencil case.
집에서 자를 찾고 있어요.
I am looking for a ruler at home.
문구점에서 새 자를 샀어요.
I bought a new ruler at the stationery store.
여행 가방에 작은 자를 넣었어요.
I put a small ruler in my travel bag.