Monday
April 21, 2014

Homework Help: Math: Distance and Midpoint

Posted by Anonymous on Tuesday, April 24, 2012 at 6:05pm.

Three points on the edge of a circle are (-220, 220), (0, 0), and (200, 40), where each unit represents 1 foot. What is the diameter of the circle to the nearest 10 feet?

I know the answer is supposed to be 550 ft, but I keep coming up with the wrong answer. I found the midpoint of (-220, 220) and (0, 0) which is (-110, 110). Its perpendicular bisector is y = (1/2)x +165, if I did it correctly. I also found the midpoint of (0, 0) and (200, 40), which is (100, 20). I got y = -5x + 520 for its perpendicular bisect. Using those two equations, I found the intersect/center of the circle, (710/11, 2170/11). But when I use the distance formula with that point and (0, 0) to find the distance/radius, I get about 207.5, and the diameter about 415. What did I do wrong?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Geometry, Help - 1. Reasoning How does the Distance Formula ensure that the ...
Math - the cube has a volume of 8.If point x,the midpoint of AV is joined to ...
geometry - Between the points (8,-6) and (-8, 6) find A.) The distance (...
Algebra - Consider the points (3, 1) and (9, 2). (a) State the midpoint of the ...
Geometry - how do you solve using midpoint equation if you only have one pair of...
Math - How do you find the distance and midpoint between two points in the ...
Math: is this the right answer? - i have to find the midpoint... the two points ...
math - have a question in math (( distance between two points )) show that C(-5...
math - have a question in math (( distance between two points )) show that C(-5...
midpoint question - find the midpoint between these points (-2,7)and (-8,-5) ...

Search
Members