mckenzieandjesus
  • mckenzieandjesus
is tangent to circle O at B. What is the length of the radius r? Round to the nearest tenth. 4.8 8.4 11.0 23.0
Geometry
jamiebookeater
  • jamiebookeater
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mckenzieandjesus
  • mckenzieandjesus
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mckenzieandjesus
  • mckenzieandjesus
mckenzieandjesus
  • mckenzieandjesus
AB is tangent to circle O at B

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jim_thompson5910
  • jim_thompson5910
same idea as before r^2 + 5^2 = 9.8^2 solve for r
mckenzieandjesus
  • mckenzieandjesus
do i subtract 5^2 from 9.8^2?
mckenzieandjesus
  • mckenzieandjesus
sorry im really tired
jim_thompson5910
  • jim_thompson5910
yes
mckenzieandjesus
  • mckenzieandjesus
so 71.04, 71.04^2+5^2 right?
jim_thompson5910
  • jim_thompson5910
you didn't subtract
jim_thompson5910
  • jim_thompson5910
9.8^2 - 5^2
jim_thompson5910
  • jim_thompson5910
oh nvm 9.8^2 - 5^2 = 71.04
jim_thompson5910
  • jim_thompson5910
r^2 = 71.04 r = ????
mckenzieandjesus
  • mckenzieandjesus
is 71.04?
jim_thompson5910
  • jim_thompson5910
square root the 71.04
mckenzieandjesus
  • mckenzieandjesus
but thats a big number..
jim_thompson5910
  • jim_thompson5910
square ROOT
mckenzieandjesus
  • mckenzieandjesus
oh my gosh.. im sorry, 4 square root 111/5
mckenzieandjesus
  • mckenzieandjesus
decimal form is 18.84675..
jim_thompson5910
  • jim_thompson5910
\[\Large \sqrt{71.04} \approx 8.4285230022821911\] http://web2.0calc.com/#sqrt(71.04)
mckenzieandjesus
  • mckenzieandjesus
the calculator was wrong then. so ould it be 8.4?
jim_thompson5910
  • jim_thompson5910
roughly, yeah
jim_thompson5910
  • jim_thompson5910
I would just use that calc instead
mckenzieandjesus
  • mckenzieandjesus
ok thank you
jim_thompson5910
  • jim_thompson5910
sure thing

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