# A goat

In the square garden of side (a), a goat is tied in the middle of one side. Calculate the length of the rope (r) so that the goat grazes exactly half the garden. If r = c * a, find the constant c.

## 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**- Pythagorean theorem
- circle
- triangle
- square
- circular sector

### Units of physical quantities:

### Grade of the word problem:

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