Question

Center of a circle is (2a-1,7) and it passes through the point (-3,-1) if the diameter of the circle is 30 units find the value of a

Answer 1

Answer:

Step-by-step explanation:

equations of circle = >

r^2 = ( x-2a+1)^2 + (y-7)^2

diameter = 20

so radius = 20/2 = 10

10^2 = (x-2a+1)^2 + ( y-7)^2

circle is passing through ( -3,-1)

so

100 = ( -3-2a+1)^2 + (-1-7)^2

100 = (-2-2a)^2 + 64

36 = ( -2-2a)^2

6 = -2-2a

8 = -2a

a= - 4

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