# Circumference 6338

The circle has the same area as the square, whose circumference is 400m. Calculate the diameter of the circle.

## Correct answer:

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

**algebra**- equation
- expression of a variable from the formula
**planimetrics**- circle
- area of a shape
- perimeter
- square

### Units of physical quantities:

### Grade of the word problem:

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