In week 17 we finished last chapter.This chapter about Trigonometry.It was easy chapter.and we have test about this chapter on Wednesday.
example: a²=b²+c² we just apdate to r²=x²+y² .This is a firs lesson
The second lesson about reference angles.The reference angle for any angle in standard position can be determined .for an angle in Quadrant 2 such as 155°,the reference angle is:
180º-155°=25°
The fours lesson about sine law
And in the last lesson in this chapter we learned the coding law.
The coding Low :ΔASL a²=s²+l²-2sl cosA