Computer Drawing A mathematics professor wanted to use a computer drawing program to draw a picture of a regular pentagon (a five-sided figure with sides of equal length and with equal angles). He first made a 1 -in. base by drawing a line from $(0,0)$ to $(1,0) .$ (See the figure.) He then needed to find the coordinates of the other three vertex points. Use trigonometry to find them. (Hint: The sum of the exterior angles of any polygon is $360^{\circ} . )$