Directions: What is the biggest area of a quadrilateral you can fit in a circle that has a circumference of 20π units?

### Hint

Which quadrilateral would have the biggest area that would also fit in a circle? Because you know the circumference of a circle, what could be the next thing you can find? Explain your process on choosing which quadrilateral you thought would maximize the area, while still fitting in the circle.

### Answer

200 square units

Source: Nanette Johnson