Two circles, A and B, touch each other at exactly one point, as shown in the diagram below. The equation of circle A is . Circle B has centre (1, k + 1) and radius 4.
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i) Find the completed square form of x2 - 18x
Find the completed square form of y2 - 2y
ii) Use your answer from part i) to express the equation of circle A in the form
(x - a)2 + (y - b)2 = r2
iii) write down the centre and radius of circle A.
i) Explain why the distance between the centres of circles A and B is 10.
ii) Express this distance also in terms of k, and hence find the two possible values of k.
iii) Hence show that the two possible equations of circle B are
c) Show algebraically that the line y = 4/3 x - 1 is a tangent to circle A, and give the coordinates of the point of contact.
(You should work with fractions in this part of the question)© BrainMass Inc. brainmass.com March 4, 2021, 6:13 pm ad1c9bdddf
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