Question

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

Answer 1

@jim_thompson5910

Answer 2

AB is tangent to circle O at B

Answer 3

same idea as before

r^2 + 5^2 = 9.8^2

solve for r

Answer 4

do i subtract 5^2 from 9.8^2?

Answer 5

sorry im really tired

Answer 6

yes

Answer 7

so 71.04, 71.04^2+5^2 right?

Answer 8

you didn't subtract

Answer 9

9.8^2 - 5^2

Answer 10

oh nvm

9.8^2 - 5^2 = 71.04

Answer 11

r^2 = 71.04

r = ????

Answer 12

is 71.04?

Answer 13

square root the 71.04

Answer 14

but thats a big number..

Answer 15

square ROOT

Answer 16

oh my gosh.. im sorry, 4 square root 111/5

Answer 17

decimal form is 18.84675..

Answer 18

\[\Large \sqrt{71.04} \approx 8.4285230022821911\]

http://web2.0calc.com/#sqrt(71.04)

Answer 19

the calculator was wrong then. so ould it be 8.4?

Answer 20

roughly, yeah

Answer 21

I would just use that calc instead

Answer 22

ok thank you

Answer 23

sure thing