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Pie
3 years ago
8

The point (-3, 2) lines on a circle whose equation is (x + 3)2 + ( + 1)2 = r2. Which of

Mathematics
1 answer:
Tju [1.3M]3 years ago
8 0

Answer:

3 units

Step-by-step explanation:

Equation of the circle is:

(x+3)^2 +(y+1)^2=r^2

\therefore [x-(-3)] ^2 +[(y-(-1)] ^2=r^2

Equating it with

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

We find: h = - 3 & k = - 1

Center of the circle (C) = (-3, - 1)

Since, the point (-3, 2) lies on the circle, therefore radius of the circle wii be equal to the distance between the center of the circle (-3, - 1) and the point (-3, 2) which is on the circle.

Therefore,

r = \sqrt{[-3-(-3)]^2 +[2-(-1)]^2}

r = \sqrt{[-3+3]^2 +[2+1]^2}

r = \sqrt{[0]^2 +[3]^2}

r = \sqrt{0 +9}

r = \sqrt{9}

r = 3\: units

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