Explain why arccos (-1/2) does not equal 4pi/3 even though cos (4pi/3)=-1/2

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there

Answer might be d.i think

1. statement- ca is parallel to db and e is the midpoint of ad reason- given2. statement- reason- alternate interior angles3. statement- de is congruent to ae reason- definition of midpoint4. statement- triangle aec is congruent to triangle deb reason- asa (angle side angle)