In $△XYZ$, all the three sides are equal to $5 cm$. What type of triangle is it? What is the measurement of each of the angles of $△XYZ$?

In $△PQR$, $PS\perp QR$, if $\angle QPR=60°$ and $\angle R=50°$, find $\angle RPS$ and $\angle PQS$.

In the given figure, $l\parallel m$, if $QP\perp l$ and $SR\perp l$ and $PQ=3.5 cm$, find $SR$.

Draw all the three altitudes of the given $△ABC$.