Question

line AB is tangent to circle O at B. What is the length of the radius r? Round to the nearest tenth.

Answer 1

can you please help? @Jhannybean

Answer 2

is it 3.6? O:

Answer 3

@Hero

Answer 4

hint" the angle AB makes with radius r=90 degrees.

Answer 5

other wise, that AB is not instantaneous rate of change @ point of intersection.

Answer 6

Well,use the pythagorean theorem. Since AB is tangent to the circle line AB and the radius, r make create a perpendicular angle, 90 degrees.

Answer 7

so im wrong? @katherine.ok

Answer 8

sorry, the radius perpendicularly bisects line AB, which is tangent to the circle.

Answer 9

And this in turn creates a right triangle, A0B

Answer 10

yes you are wrong.

Answer 11

Use the pythagorean theorem : \(\large c^2 = a^2 + b^2\) where c = hypotenuse = 8.6 and a= r, and b = 5

Answer 12

my next guess would have to be 7.0

Answer 13

okay ill do that then

Answer 14

\[\large c^2 = a^2 + b^2\]\[\large (8.5)^2 = (5)^2 + r^2 \]\[\large r^2 = (8.5)^2 - (5)^2 \]\[\large r = \sqrt{(8.5)^2 -(5)^2}\] solve for r.

Answer 15

8.5^2= a^2+5^2

Answer 16

@Ahmad1

Answer 17

need any there :)

Answer 18

would you say 7.0? o:

Answer 19

about right because 8.6^2= 7^2+5^2

Answer 20

yes I would ;)

Answer 21

finally im right :D lol thanks guys !

Answer 22

you are always right dude @cocopuffs90

Answer 23

thanks dude!