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Lesson: Geometry Challenging - 13

The Area Of Circumscribed Squares

[Page 13 of 32]

Standardized tests will often ask you to find the area of a circumscribed square.

To find the area of square IJKL, we need to know the length of a side. Let's see if we can use the circumference of the inscribed circle to find this measurement.

We know that we can figure out the circle's diameter and radius from the circumference. How does this help? Well, the diameter of the circle is the same length as each side. Because squares have parallel sides, any line that is perpendicular to IL and JK and that connects these two lines will have the same length as IJ. The diameter of Circle O is one such line.

Circumference equals . Since Circle O has a circumference of 8, its diameter is 8. So, each side of the square is also 8.

Therefore, the area of IJKL is .

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