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32 votes
32 votes
50 POINTS if p=(-2,-1) and Q=(-6,-3) are the endpoints of the diameter of a circle, find the equation of the circle

User Erik Doernenburg
by
3.3k points

2 Answers

21 votes
21 votes

Answer:

(x+4)^2 + (y+2)^2 = 5

Step-by-step explanation:

Using the midpoint formula, we find that the center of the circle is (-4, -2). We also calculate using the distance formula that between the two points is
imageor
image.

Because we found the diameter, to find the radius we divide by two, getting
image.

Now that we have the center, (-4, -2), and the distance from the center to the radius, we can put the information into the circle equation:

(x-h)^2 + (y-k)^2 = r^2

This becomes:

(x+4)^2 + (y+2)^2 = 5

User Oleg Butuzov
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2.9k points
10 votes
10 votes

Answer:

-4 , -2 , 5

Step-by-step explanation:

(x-(-4))^2+(y-(-2))^2=5

since 2 negatives equal a positive, - -4 = +4

same thing for -2

(x+4)^2+(y+2)^2=5

User Stephane Godbillon
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3.0k points