# Circle and square

An ABCD square with a side length of 100 mm is given. Calculate the circle’s radius that passes through vertices B, C, and the center of the side AD.

## Correct answer:

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

**algebra**- quadratic equation
- equation
- expression of a variable from the formula
**planimetrics**- Pythagorean theorem
- right triangle
- circle
- triangle
- square

### Units of physical quantities:

### Grade of the word problem:

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