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Distance between points (x1,y1) and (x2,y2) is
\(\huge d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}\)

first 2 are correct

Youv'e done the first one correct.

show what u done for 3rd ??

You didn't tick the 3rd one ?

Yep, both are correct!

so u got 3 confirmations for 1st 2 :P

ok :)

How come (-8)^2=-64 ?

(-8)^2=-8*-8=
(-)(-)=+

Yeah :D

huh ? Just show me the steps.

Continue from here,
\[\sqrt{64+36}\]

Yay :D

Here is your medal :D

\[\frac{ x^2 }{ a^2 }+\frac{ y^2 }{ b^2 }=1\]
Yeah your'e Actually right :)

yes, u r right.