The radius of any circle touching the lines 3x - 4y + 5 = 0 and 6x - 8y - 9 = 0 is:
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3x-4y+5=0 ........×2
=6x-8y+10=0
6x-8y-9=0
subtracting
r=19
=6x-8y+10=0
6x-8y-9=0
subtracting
r=19
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