The tangent line is perpendicular to the radius, so will have slope
.. -1/2.5 = -0.4 . . . . . . corresponding to the 3rd selection
(13*13) + (28*28) = 953
square root = 30.8706…
31cm
X=5 y=1 this what i got when i worked it out on my paper. hope that helps.
