The distance of the point $A (a, b, c)$ from the x-axis is

a

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\sqrt{b^{2} + c^{2}}

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\sqrt{a^{2} + b^{2}}

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a^{2} + b^{2}

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Solution

The correct option is B $\sqrt{b^{2} + c^{2}}$
The given point is $(a, b, c)$
The distance of the point $(a, b, c)$ from x-axis will be the perpendicular distance from point $(a, b, c)$ to x-axis whose co-odinates will be $(a, 0, 0)$
Now, we have to use the distance formula
Distance= $\sqrt{(a - a)^{2} + (b - 0)^{2} + (c - 0)^{2}} = \sqrt{b^{2} + c^{2}}$

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If a + b + c = 2s, then prove the following identities

(a) s² + (s − a)² + (s − b)² + (s − c)² = a² + b² + c²

(b) a² + b² − c² + 2ab = 4s (s − c)

(d) a² − b² − c² + 2ab = 4(s − b) (s − c)

(e) (2bc + a² − b² − c²) (2bc − a² + b² + c²) = 16s (s − a) (s − b) (s − c)

(f)

\frac{a^{2} - b^{2} - c^{2}}{(a - b) (a - c)} + \frac{b^{2} - c^{2} - a^{2}}{(b - c) (b - a)} + \frac{c^{2} - a^{2} - b^{2}}{(c - a) (c - b)}

|\begin{matrix} - a (b^{2} + c^{2} - a^{2}) & 2 b^{3} & 2 c^{3} \\ 2 a^{3} & - b (c^{2} + a^{2} - b^{2}) & 2 c^{3} \\ 2 a^{3} & 2 b^{3} & - c (a^{2} + b^{2} - c^{2}) \end{matrix}| = a b c {(a^{2} + b^{2} + c^{2})}^{3}

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