Answers

2015-10-30T23:30:40+05:30
The of length PQ is 5units
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2015-10-31T01:06:49+05:30
Coordinate of point P is (4,5)
As PQ is drawn perpendicular to X - axis, Coordinate of point Q is (4,0)
By Distance formula we can find the length of PQ :
PQ =   \sqrt {(x_{2} -  x_{1})^{2} } + {(y_{2} -  y_{1})^{2}}
            = \sqrt {(4 - 4)^{2} } + {(0 - 5)^{2}}
            = \sqrt{(- 5)^{2}}
            = \sqrt{25}
            = 5 units.
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in my opinion the root sign will extend upto (y2 - y1)2
i tried to do that by it not happening
i tried to do that but it not happening
ok don't mind