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Three Dimensional (3-D) Coordinate System

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key points: Three Dimensional (3-D) Coordinate System

Coordinates on Axes

  • X-axis → (x,0,0)(x, 0, 0)(x,0,0)

  • Y-axis → (0,y,0)(0, y, 0)(0,y,0)

  • Z-axis → (0,0,z)(0, 0, z)(0,0,z)

Coordinates on Planes

  • XY-plane → (x,y,0)(x, y, 0)(x,y,0)

  • YZ-plane → (0,y,z)(0, y, z)(0,y,z)

  • ZX-plane → (x,0,z)(x, 0, z)(x,0,z)

Distance from Coordinate Planes

  • From XY-plane → ∣z∣

  • From YZ-plane → ∣x∣

  • From ZX-plane → ∣y∣

Distance from Origin

\[\sqrt{x^{2}+y^{2}+z^{2}}\]

Distance Between Two Points

\[d=\sqrt{(x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2}+(z_{2}-z_{1})^{2}}\]

Octants:

Octants I II III IV V VI VII VIII
Coordinates OXYZ OX′YZ OX′Y′Z OXY′Z OXYZ′ OX′YZ′ OX′Y′Z′ OXY′Z′
x + + + +
y + + + +
z + + + +
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