saideumireowa sagakjidaereul hwaginhapnida.

와 means and.

In Korean, 와/과 is used to join nouns:

• 와 after a noun ending in a vowel
• 과 after a noun ending in a consonant

So:

• 사이드미러와 사각지대 = side mirrors and blind spot(s)

Because 사이드미러 ends in a vowel sound, 와 is the correct form here.

Because 사이드미러와 사각지대 works as one combined object, and Korean often puts the object marker only on the last noun in that kind of list.

So:

• 사이드미러와 사각지대를 확인합니다 means that side mirrors and blind spot(s) together are the thing being checked.

This is a very common pattern in Korean. Compare:

• 사과와 바나나를 먹어요 = I eat apples and bananas

You do not need to attach 를 to both nouns.

사각지대를 = 사각지대 + 를

• 사각지대 = blind spot
• 를 = object particle

Since 사각지대 ends in a vowel, it takes 를 rather than 을.

So 사각지대를 확인합니다 literally means check the blind spot or check blind spots, depending on context.

The dictionary form is 확인하다, which means to check, to confirm, or to verify.

확인합니다 is the formal polite present-style form:

• 확인하다 → dictionary form
• 확인합니다 → formal polite

This style is very common in:

• instructions
• announcements
• manuals
• driving lessons
• formal writing

Grammatically, 확인합니다 is a present-tense formal statement, but in context it often functions like an instruction.

So in a driving manual or lesson, it can feel like:

• Check the side mirrors and blind spot(s).

This is very normal in Korean. Formal statements are often used for step-by-step directions or rules.

A more direct spoken command would be:

• 확인하세요 = Please check
• 확인해 주세요 = Please check

But 확인합니다 sounds more like textbook/manual language.

Because 확인하다 is more specific than 보다.

• 보다 = to see / to look at
• 확인하다 = to check / verify / make sure

In a driving context, you are not just looking casually. You are checking for safety and confirming that the area is clear. That is why 확인하다 is the better verb here.

So 확인합니다 has a more deliberate, safety-related nuance.

No. This is a very common point of confusion.

In 사각지대, 사각 does not mean four corners or square here. It comes from a different Sino-Korean word meaning blind angle or dead angle.

So:

• 사각지대 = blind spot
• not square zone

Even though 사각 can mean something like four corners in other words, that is not the meaning in this expression.

Korean often does not mark plural when the meaning is already clear from context.

So:

• 사이드미러 can mean side mirror or side mirrors
• 사각지대 can mean blind spot or blind spots

In English, you often translate this naturally as plural:

• Check the side mirrors and blind spots

But Korean usually leaves that unmarked unless there is a special reason to emphasize plurality.

It is a loanword based on English side mirror, adapted to Korean pronunciation.

This is very common in Korean, especially for things related to cars, technology, and modern life.

So 사이드미러 is perfectly natural Korean usage, even though its origin is English.

You may also hear other expressions depending on context, but 사이드미러 is very common in everyday speech.

Yes, but the tone changes.

These all can mean and:

• 와/과 = more neutral or formal
• 하고 = common in everyday speech
• (이)랑 = casual, conversational

So you could say:

• 사이드미러하고 사각지대를 확인해요
• 사이드미러랑 사각지대를 확인해요

Those sound more conversational.
The original sentence uses 와 because it matches the more formal, instructional style of 확인합니다.

Because Korean often omits the subject when it is obvious from context.

In an instruction or manual, the understood subject is usually something like:

• you
• the driver
• one

So the sentence does not need to say:

• 운전자는 사이드미러와 사각지대를 확인합니다

That version is possible, but the shorter version is more natural when the context already makes the subject clear.