Distance betweentwo parallel planes `2x""+""y""+""2z""=""8`and `4x""+""2y""+""4z""+""5""=""0`is(1) `5/2`(2) `7/2`(3) `9/2`(4) `3/2`A. `3/2`B. `5/2`C. `7/2`D. `9/2`

Distance betweentwo parallel planes `2x""+""y""+""2z""=""8`and `4x""+"

1.	Distance betweentwo parallel planes `2x""+""y""+""2z""=""8`and `4x""+""2y""+""4z""+""5""=""0`is(1) `5/2`(2) `7/2`(3) `9/2`(4) `3/2`A. `3/2`B. `5/2`C. `7/2`D. `9/2`
Answer» Correct Answer - C Equations of the given planes are `2x+y+2z-8=0` and `2x+y+2z+5/2=0`.Let `d` be the distance between these planes, Then `d=\|(-8-5/2)/(sqrt(2^(2)+1^(2)+2^(2)))\|=21/6=7/2`

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