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# Find the Ratio in Which the Line Joining (2, 4, 5) and (3, 5, 4) is Divided by the Yz-plane. - Mathematics

Find the ratio in which the line joining (2, 4, 5) and (3, 5, 4) is divided by the yz-plane.

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#### Solution

Let A$\equiv$(2, 4, 5) and B$\equiv$(3, 5, 4)Let the line joining A and B be divided by the yz-plane at point P in the ratio$\lambda: 1$

Then, we have:
P$\equiv \left( \frac{3\lambda + 2}{\lambda + 1}, \frac{5\lambda + 4}{\lambda + 1}, \frac{4\lambda + 5}{\lambda + 1} \right)$

Since P lies on the yz-plane, the x-coordinate of P will be zero.

$\therefore \frac{3\lambda + 2}{\lambda + 1} = 0$
$\Rightarrow 3\lambda + 2 = 0$
$\therefore \lambda = \frac{- 2}{3}$

Hence, the yz-plane divides AB in the ratio 2:3 (externally).

Concept: Three Dimessional Space
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#### APPEARS IN

RD Sharma Class 11 Mathematics Textbook
Chapter 28 Introduction to three dimensional coordinate geometry
Exercise 28.3 | Q 4 | Page 20
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