What is 12 1/2% as a fraction in simplest form

Can someone tell me if this is perpendicular? !

If value of cos330° is √3/2 then find tan165°.

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units