gena19
gena19
22-04-2017
Mathematics
contestada
AB is tangent to C. I need to find the value of r.
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kettboy
kettboy
22-04-2017
Tangent always meets radius at 90° angle.
Angle ABC = 90° so Pythagoras' theorem applies.
r² + 4² = (r+2)²
r² + 16 = r² + 4r + 4
12 = 4r
r = 3
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