I need help with 3&4 ...

Mathematics

2 answers:

Montano1993 [528]3 years ago

8 0

2*5=10 is the answer

scZoUnD [109]3 years ago

6 0

General form for circle is
(x - a)^2 + (y - b)^2 = r^2

so if center is at (3,-2) we can plug in a and b:-

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

Now plug in x = 7 and y =1 (from the point R)

4^2 + 3^2 = r^2
r^2 = 25 making r = 5

so its diameter = 2*5 = 10

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