# Rectangle

The rectangle is 21 cm long and 38 cm wide.

Find the radius of the circle circumscribing the rectangle.

Find the radius of the circle circumscribing the rectangle.

## Correct answer:

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See also our right triangle calculator.

See also our trigonometric triangle calculator.

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

**arithmetic**- square root
- square (second power, quadratic)
**planimetrics**- Pythagorean theorem
- right triangle
- circle
- triangle
- diagonal
- rectangle
**numbers**- real numbers

### Units of physical quantities:

### Grade of the word problem:

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