Precal 40s february 8th

Hey everybody its Daniel, this is what we learned on February 8th.

First we learnt that two supplementary angles add up to 180 degrees or pie. Supplementary = Straight line

and that two complementary angle add up to 90 degrees or pie/2. Complementary = Corner.



 Next we learnt the formula s=r(feta) . Where (feta) must always be in RADIANS !!!

s= arch of the section


r= radius if the circle


(feta) = angle in radians




Area of a Sector

(feta)r^2 /2