# Perpendicular projection

Determine the distance of a point B[1, -3] from the perpendicular projection of a point A[3, -2] on a straight line 2 x + y + 1 = 0.

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**geometry**- analytic geometry
- vector
- scalar product
**algebra**- intersection of sets
**planimetrics**- Pythagorean theorem

#### Units of physical quantities:

#### Grade of the word problem:

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