In the following figure, straight lines $l, m$ and $n$ are parallel to each other and $G$ is the mid-point of $CD$. Find $BG,$ if $AD=6 \mathrm{cm}$.

In the following figure, straight lines $l, m$ and $n$ are parallel to each other and $G$ is the mid-point of $CD$. Find $CF,$ if $GE=2.3 cm$.

In the following figure, straight lines $l, m$ and $n$ are parallel to each other and $G$ is the mid-point of $CD$. Find $AB,$ if $BC=2.4 \mathrm{cm}$.

In the following figure, straight lines $l, m$ and $n$ are parallel to each other and $G$ is the mid-point of $CD$. Find $ED,$ if $FD=4.4 \mathrm{cm}$.

In a $△ABC, AB=3 \mathrm{cm}, BC=4 \mathrm{cm}$ and $CA=5 \mathrm{cm}$. If $D$ and $E$ are mid-points of $AB$ and $BC$ respectively, then the length of $DE$ is

In the adjoining figure, $ABCD$ is a rectangle in which $AB=6 \mathrm{cm}$and $AD=8 \mathrm{cm}$. If $P$ and $Q$ are mid-points of the sides $BC$ and $CD$ respectively, then the length of $PQ$ is