A line is parallel to $X Y$-plane if all the points on the line have equal ........... .
$z$-coordinates.
A line is parallel to $X$-axis, if all the points on the line have equal .............. .
$y$ and $z$-coordinates.
$x=a$ represent a plane parallel to .............. .
$x=$ a represent a plane parallel to $Y Z$-plane.
The plane parallel to YZ-plane is perpendicular to .................... .
The plane parallel to $Y Z$-plane is perpendicular to $X$-axis.
The length of the longest piece of a string that can be stretched straight in a rectangular room whose dimensions are 10, 13 and 8 units are ............. .
Given dimensions are $a=10, b=13$ and $c=8$.
$$\begin{aligned} \therefore \quad \text { Required length } & =\sqrt{a^2+b^2+c^2} \\ & =\sqrt{100+169+64}=\sqrt{333} \end{aligned}$$