Work out 2/5 of 8 please help me

Aparking lot is to be 400 feet wide and 370 feet deep. how many standard-sized cars fit in this lot considering a double-loaded (w4) two way traffic set up, an angle of 90° and a sw of 9’ 0’’? (do not consider handicapped parking spaces, and consider 15’ for turning aisles). show your work.

How to do this , and can some one explain

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?