Aquadrilateral has 4 right angles and 4 sides of equal length. what is the name of the quadrilateral?

Anyone know? will mark brainliest if you're correct!

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

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