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Explain solution RD Sharma Class 12 Chapter 26 Direction Cosines and Direction Ratios Exercise Very Short Answer Question, question 13 Maths.

Answers (1)

Answer:

z units

Hint:

z=0

Given:

P(x, y, z)

Solution:

In xy plane z co-ordinate is zero.

By distance formula.

\begin{aligned} &d=\sqrt{\left(x_{1}-x_{2}\right)^{2}+\left(y_{1}-y_{2}\right)^{2}+\left(z_{1}-z_{2}\right)^{2}} \\ &=\sqrt{(x-x)^{2}+(y-y)^{2}+(z-0)^{2}} \\ &=\sqrt{(z)^{2}} \\ &=z \text { units } \end{aligned}

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