A rectangle measures 8cm by 4cm. Determine the mesaures of the two acute angles formed at the vertex by a diagonal.
One of the acute angles will be given by :
arctan (8/4) =
arctan (2) ≈ 63.43°
And the other will be given by :
arctan (4/8) =
arctan (1/2) ≈ 26.57°
+37 
