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stellarik [79]
3 years ago
14

AB is tangent to circle O at B. Find the length of the radius, r, for AB = 5 and AO = 13.

Mathematics
2 answers:
alekssr [168]3 years ago
8 0
ΔABO is a right triangle with AB⊥BO. The radius of the circle is BO. The Pythagorean theorem applies.
AO² = AB² + BO²
13² = 5² + r²
169 -25 = r²
r = √144 = 12

The radius (r) is 12.
MariettaO [177]3 years ago
7 0

the radius is twelve

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\boxed {D}


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