Question

What is the angle between <5,8,2> and <2,1,4>?

Answer 1

2 × 20)°, (3 × 20)°, (5 × 20)° and (8 × 20)° i.e., 40°, 60°, 100° and 160°. 3. The angles of a quadrilateral are in ratio 1 : 2 : 3 : 4.