Question

if the line x/a + y/b =1 touches the circle,
x^2 +y^2= r^2 then
a) a^2 + b^2= r^2
b) 1/a^2 +1/b^2=1/r^2
c)a^2-b^2=r^2
d)1/a^2= 1/b^2+1/r^2

Answer 1

right,
just equate the distance between origin and the line to r !
and voila! :O

Answer 2

okeie

Answer 3

i got 1/a^2 +1/b^2=1/r^2 is it true ?

Answer 4

correct ^^

Answer 5

thank you @shubhamsrg

Answer 6

glad to help.