Carcass wrote:
OE
You need to find the length of a leg of a triangle. By finding the lengths of the two other sides, you can use the Pythagorean theorem to find the third side. The hypotenuse of the triangle is the radius of the (quarter-) circle, which, since point A is at (0, 8), is 8. Since point C is (6, 0), the other leg is 6. From the Pythagorean theorem, \(6^2 + x^2 = 8^2\), so \(x^2 = 28\),\( x= \sqrt{28} = \sqrt{4 * 7} = \sqrt{4} * \sqrt{7} = 2 * \sqrt{7}\), so \(\frac{x}{ \sqrt{7} }\)=2 .
What grants us permission to assume the circle is exactly a quarter circle?