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Question -

Name the octants in which the following points lie:
(i) (5, 2, 3)
(ii) (-5, 4, 3)
(iii) (4, -3, 5)
(iv) (7, 4, -3)
(v) (-5, -4, 7)
(vi) (-5, -3, -2)
(vii) (2, -5, -7)
(viii) (-7, 2, -5)



Answer -

Solution:

(i) (5,2, 3)

In this case, since x, y and z all three are positive thenoctant will be XOYZ

(ii) (-5,4, 3)

In this case, since x is negative and y and z are positive thenthe octant will be X′OYZ

(iii) (4,-3, 5)

In this case, since y is negative and x and z are positive thenthe octant will be XOY′Z

(iv) (7,4, -3)

In this case, since z is negative and x and y are positive thenthe octant will be XOYZ′

(v) (-5,-4, 7)

In this case, since x and y are negative and z is positive thenthe octant will be X′OY′Z

(vi) (-5,-3, -2)

In this case, since x, y and z all three are negative thenoctant will be X′OY′Z′

(vii) (2,-5, -7)

In this case, since z and y are negative and x is positive thenthe octant will be XOY′Z′

(viii) (-7,2, -5)

In this case, since x and z are negative and x is positive thenthe octant will be X′OYZ′

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