Write down the number of edges of a square pyramid?

Match the following nets with the corresponding $3D$ objects.

Draw a line segment $\overline{AB}=12 \mathrm{cm}$ and mark three points $P, Q$ and $R$ on it such that:

$\overline{AP}=4 \mathrm{cm}, \overline{\mathrm{PQ}}=5 \mathrm{cm}, \overline{\mathrm{QB}}=3 \mathrm{cm}$

Which point is closer to $R$, if $\overline{RP}=3 \mathrm{cm}$

Draw a line segment $\overline{AB}=12 \mathrm{cm}$ and mark three points $P, Q$ and $R$ on it such that:

$\overline{AP}=4 \mathrm{cm}, \overline{\mathrm{PQ}}=5 \mathrm{cm}, \overline{\mathrm{QB}}=3 \mathrm{cm}$

Measure $QR$.