# Inaccessible 69794

Determine the distance between two inaccessible places P, Q, if the distance between two observation points A, B is 2000m and if you know the size of the angles QAB = 52°40''; PBA = 42°01''; PAB = 86°40'' and QBA = 81°15''. The considered locations A, B, P, and Q lie in one plane.

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

**algebra**- expression of a variable from the formula
**arithmetic**- square root
**planimetrics**- Pythagorean theorem
- polygon
- triangle
- trapezoid
- diagonal
- The Law of Cosines
- The Law of Sines
- quadrilateral
**basic functions**- reason
**numbers**- fractions
**goniometry and trigonometry**- sine
- cosine

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