Find the angle between the planes from Mathematics Three Dimens

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 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.
89 Views

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.
81 Views

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.
77 Views

 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. 
85 Views

Advertisement

 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.
87 Views

186. Find the angle between the two planes
2 x + y – 2 z = 5 and 3x – 6 y – 2 z = 7 using vector method.
76 Views

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.
78 Views

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
80 Views

Advertisement
Advertisement

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


The equations of the planes are
             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 space 5 space straight k with hat on top close parentheses space equals space 0 space space space and space space straight r with rightwards arrow on top. space left parenthesis 2 space 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
therefore space space space space space stack straight n subscript 1 with rightwards arrow on top space equals space 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 comma space space space space stack straight n subscript 2 with rightwards arrow on top space equals space 2 space 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
therefore space space space space open vertical bar stack straight n subscript 1 with rightwards arrow on top close vertical bar space equals space square root of 9 plus 16 plus 25 end root space equals space square root of 50 space equals space 5 square root of 2
space space space space 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 4 plus 1 plus 4 end root space space equals space square root of 9 space equals space 3
         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 3 right parenthesis thin space left parenthesis 2 right parenthesis space plus space left parenthesis negative 4 right parenthesis thin space left parenthesis negative 1 right parenthesis space plus space left parenthesis 5 right parenthesis thin space left parenthesis negative 2 right parenthesis space equals space 6 plus 4 minus 10 space equals space 0
Let θ be the angle between the planes
 therefore space space space space space space space 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 fraction numerator 0 over denominator 5 square root of 2 cross times 3 end fraction space equals space 0
therefore space space space space space space space space space space straight theta space equals space 90 degree.
76 Views

Advertisement
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

87 Views

Advertisement