Find the angle between the planes whose vector equations are fr

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 Multiple Choice QuestionsShort Answer Type

181. Find the vector equation of the line through the origin which is perpendicular to the plane straight r with rightwards arrow on top. space open parentheses straight i with hat on top space minus space 2 space straight j with hat on top space plus space straight k with hat on top close parentheses space equals space 3.
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182. Find the vector and cartesian equations of the planes:
that passes through the point (1, 0, – 2) and the normal to the plane is straight i with hat on top space plus space straight j with hat on top space minus space straight k with hat on top.
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183. Find the vector and cartesian equations of the planes:
that passes through the point (1, 4, 6) and the normal vector to the plane is straight i with hat on top space minus space 2 space straight j with hat on top space plus space straight k with hat on top.
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 Multiple Choice QuestionsLong Answer Type

184. Find the vector equation of the line passing through the point (3, 1, 2) and perpendicular to the plane straight r with rightwards arrow on top. space open parentheses 2 straight i with hat on top space minus space straight j with hat on top space plus space straight k with hat on top close parentheses space equals space 4. Find also the point of intersection of this line and plane. 
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 Multiple Choice QuestionsShort Answer Type

185. Find the angle between the two planes
3 x – 6 y + 2 z = 7 and 2 x + 2 y – 2 z = 5.
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186. Find the angle between the two planes
2 x + y – 2 z = 5 and 3x – 6 y – 2 z = 7 using vector method.
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187. Find the angle between the planes whose vector equations are
straight r with rightwards arrow on top. space open parentheses 2 straight i with hat on top space plus space 2 straight j with hat on top space minus space 3 straight k with hat on top close parentheses space equals space 5 space space space and space straight r with rightwards arrow on top. space open parentheses 3 straight i with hat on top space minus space 3 straight j with hat on top space plus space 5 straight k with hat on top close parentheses space equals space 3.


The equations of two planes are
            straight r with rightwards arrow on top. space open parentheses 2 space straight i with hat on top space plus space 2 space straight j with hat on top space minus space 3 space straight k with hat on top close parentheses space equals space 5
and     straight r with rightwards arrow on top. space space left parenthesis 3 space straight i with hat on top space minus space 3 space straight j with hat on top space plus space 5 space straight k with hat on top right parenthesis space equals space 3
therefore space space space space space space space stack straight n subscript 1 with rightwards arrow on top space equals space 2 space straight i with hat on top space plus space 2 space straight j with hat on top space minus space 3 space straight k with hat on top comma space space space stack straight n subscript 2 with rightwards arrow on top space equals space 3 space straight i with hat on top space minus space 3 space straight j with hat on top space plus space 5 space straight k with hat on top
           open vertical bar stack straight n subscript 1 with rightwards arrow on top close vertical bar space equals space square root of 4 plus 4 plus 9 end root space equals space square root of 17 comma space space space space open vertical bar stack straight n subscript 2 with rightwards arrow on top close vertical bar space equals space square root of 9 plus 9 plus 25 end root space equals space square root of 43
     stack straight n subscript 1 with rightwards arrow on top. space stack straight n subscript 2 with rightwards arrow on top space equals space left parenthesis 2 right parenthesis thin space left parenthesis 3 right parenthesis space plus space left parenthesis 2 right parenthesis thin space left parenthesis negative 3 right parenthesis space plus space left parenthesis negative 3 right parenthesis thin space left parenthesis 5 right parenthesis space equals space 6 minus 6 minus 15 space equals space minus 15
Let θ be angle between the planes
therefore space space cos space straight theta space equals space fraction numerator stack straight n subscript 1 with rightwards arrow on top. space stack straight n subscript 2 with rightwards arrow on top over denominator open vertical bar stack straight n subscript 1 with rightwards arrow on top close vertical bar. space open vertical bar stack straight n subscript 2 with rightwards arrow on top close vertical bar end fraction space equals space fraction numerator negative 15 over denominator square root of 17 space square root of 43 end fraction space equals space minus fraction numerator 15 over denominator square root of 731 end fraction
∴ acute angle θ is given by
cos space straight theta space equals space fraction numerator 15 over denominator square root of 731 end fraction space space space space space space space space rightwards double arrow space space space straight theta space equals space cos space to the power of negative 1 end exponent space open parentheses fraction numerator 15 over denominator square root of 731 end fraction close parentheses.
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188. Find the angle between the planes whose vector equations are
straight r with rightwards arrow on top. space open parentheses straight i with hat on top space plus space straight j with hat on top space minus space 2 space straight k with hat on top close parentheses space equals space 3 space space and space space space straight r with rightwards arrow on top. space space open parentheses 2 straight i with hat on top space minus space 2 straight j with hat on top space plus space straight k with hat on top close parentheses space equals space 2
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189. Find the angle between the planes
straight r with rightwards arrow on top. space open parentheses 3 space straight i with hat on top space minus space 4 space straight j with hat on top space plus space 5 space straight k with hat on top close parentheses space equals space 0 space space and space straight r with rightwards arrow on top. space space left parenthesis 2 straight i with hat on top space minus space straight j with hat on top space minus space 2 space straight k with hat on top right parenthesis space equals space 0

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190. In the following cases, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the angles between them:
7x + 5y + 6z + 30 = 0 and 3x – y – 10z + 4 = 0

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