Question $2($b$)$: Geometric Design

$($i$)$ With the aid of a diagram illustrate a typical crest vertical curve and indicate

the following elements:

$($a$)$SVC$,$ VIP and EVC $(\frac{1}{2}+\frac{1}{2}+\frac{1}{2})$

$($b$)$The grade$1$ and grade$2$ with their signs $(+$ve or $-$ve$)(\frac{1}{2}+\frac{1}{2})$

$($c$)$The curve length $(\frac{1}{2})$

$($d$)$Location of the mid$-$ordinate $(\frac{1}{2})$

$($ii$)$ What do we mean when we refer to a vertical curve as symmetrical? $(11/2)$