Identify the radius and the center of a circle whose equation is (x – 5)² + y² = 81.
the radius of the circle is
units.
the center of the circle is at (
,
).

The 3rd semi-circle equals 31.

Step-by-step explanation:

Since the Pythagorean Theorem states that "The sum of the areas of the two squares on the legs (a and b) equals the area of the square on the hypotenuse (c)," we can find the answer of the 3rd semi-circle by finding the sum of each of the 2 smaller semi-circles and adding them together.