91Ó°ÊÓ

WRITING Explain how to find the measure of a circumscribed angle.

Coplanar circles that have a common center are called _______.

In Exercises 3–8, write the standard equation of the circle. (See Example 1.) a circle with center \((0,0)\) and radius 7

In Exercises 3–8, write the standard equation of the circle. (See Example 1.) a circle with center \((4,1)\) and radius 5

In Exercises 3–8, write the standard equation of the circle. (See Example 1.) a circle with center \((-3,4)\) and radius 1

In Exercises 3–8, write the standard equation of the circle. (See Example 1.) a circle with center \((3,-5)\) and radius 7

In Exercises 9–11, use the given information to write the standard equation of the circle. (See Example 2.) The center is \((0,0),\) and a point on the circle is \((0,6)\).

In Exercises 9–11, use the given information to write the standard equation of the circle. (See Example 2.) The center is \((1,2),\) and a point on the circle is \((4,2)\).

In Exercises 9–11, use the given information to write the standard equation of the circle. (See Example 2.) The center is \((0,0),\) and a point on the circle is \((3,-7)\).

Describe and correct the error in finding CD. graph cannot copy $$\begin{array}{c}{\mathrm{CD} \cdot \mathrm{DF}=\mathrm{AB} \cdot \mathrm{AF}} \\ {\mathrm{CD} \cdot 4=5 \cdot 3} \\ {\mathrm{CD} \cdot 4=15} \\\ {\mathrm{CD}=3.75}\end{array}$$