Question

Geometry help

Answer 1

because AB is a tangent to the circle triangle ABO is rightangled
use pythagoras

Answer 2

the radius AO meets the tangent at A so angle BAO = 90 degrees

Answer 3

what can you say about the sides AO and CO ?

Answer 4

a^2 + b^2 = c^2 so 48^2+ 90^2=100^2

Answer 5

no

OB^2 = AB^2 + AO^2

Answer 6

AO = 48 and OB = BC + OC = 100 + ?

Answer 7

what is the length of OC?
AO = OC as they are both radii of the circle

Answer 8

52?

Answer 9

no
whats the length of AO?

Answer 10

its given to you AO = 48

so OB = 100 + 48 = 148

do u follow that/

Answer 11

yes i follow that

Answer 12

ok so now you can plug in these values into the pythogoras formula:


148^ = AB^2 + 48^2

now u can find AB^2 and then AB

Answer 13

" 148^2

Answer 14

1904=AB^2 + 2304

Answer 15

21904 = AB^2 + 2304

Answer 16

now subtract 2304 from both sides and take the square root of the answer

Answer 17

384160000

Answer 18

hmmm - how did u get that?

did u take the square root or the square??

Answer 19

u took the square

Answer 20

i did 21904-2304 = 19600^2=384160000

Answer 21

yup thats the square

Answer 22

its thesquare root of 19600 u want

Answer 23

thats what i got when i did the square root

Answer 24

you pressed the wrong button on ur calculator -or maybe you didn't use the shift key

Answer 25

140

Answer 26

hit the wrong key

Answer 27

they are right next to each other

Answer 28

140 is correct

Answer 29

AB^2 = 19600
so AB = square root of AB^2 = sqrt 19600 = 140