A line segment through the center of the circle intersects the circle at the points ​(1​,5​) and (5​,11​).   1.) Find the coordinates of the​ circle's center:   2.) Find the radius of the circle:   3.) Use your answers from parts​ (a) and​ (b) to write the standard form of the​ circle's equation

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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A line segment through the center of the circle intersects the circle at the points ​(1​,5​) and (5​,11​).
 
1.) Find the coordinates of the​ circle's center:
 
2.) Find the radius of the circle:
 
3.) Use your answers from parts​ (a) and​ (b) to write the standard form of the​ circle's equation:
Expert Solution
Step 1

Given a line segment through the center of the circle intersects the circle at the points (1,5)and (5,1).

Since, it passes through center, so given points are endpoints of diameter.

Center of circle is at mid of the diameter.

Using mid point formula,

x,y=x1+x22,y1+y22=1+52,5+112=3,8

Therefore, the coordinates of the circle's center is (3,8).

Step 2

Now, radius of the cirlce will be distance between center of circle and point on a circle.

Center is (3,8) and take one point on circle (1,5).

Using distance formula,

r=x2-x12+y2-y12=1-32+5-82=4+9=13

Therefore, radius of circle is 13.

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