1) Since RW is tangent to circle, angle x = 90

10) using pythagoras theorem, (18+r)^2 = r^2 + 36*36

=> 18^18 + 36r = 36*36

=> 9+r = 36

=>r = 27 units

11) radius = sqrt(36) = 6

center = (-3,4)

12) radius = swrt(25) = 5

center = (-2,-2)

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