# Two chords

Calculate the length of chord AB and perpendicular chord BC to the circle if AB is 4 cm from the circle's center and BC 8 cm from the center.

### Correct answer:

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

**geometry**- similarity of triangles
**algebra**- quadratic equation
- equation
- system of equations
- expression of a variable from the formula
- biquadratic equation
**planimetrics**- Pythagorean theorem
- right triangle
- circle
- triangle
- chord

#### Units of physical quantities:

#### Grade of the word problem:

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