If PQ=28cm, then find the perimeter of ∆PLM (I know the traditional way using the side lengths, but I would like an explanation for finding it using the Pythagorean Theorem, pls! :D)

Give me the equations of two lines that have the same slope but are not parallel.

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.