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Assuming bc stands for b*c and not 10b+c (as in 35 can stand for 3*10+5), the answer is 1/c
A=B , A-B=B-B , A-B =0 B=C , B-B=C-B, 0=C-B So A-B=0 but also C-B=0 A-B=C-B ...add +b ...A-B+B=C-B+B , A=C
For a right angle triangle in Pythagoras' theorem of a2+b2 = c2 the letters a and b stand for the shorter sides and c stands for the longest side which is the hypotenuse.
a/b = c/d Multiply both sides by b/c Thus (a/b)*(b/c) = (c/d)*(b/c) ie a/c = b/d