Alrighty so we have our exam this week on Flatland. Basically just study the questions we did in class along with the vocabulary words. okay I am going to review some trig laws:


*Law of Sines: sin(opp. angle)/Leg =sin(Opp. angle)/Leg.

Example: triangle ABC where A=36 degrees a=3 and B=56 degrees. find b

sin36/3=sin56/x 3sin56/sin36= x

*Law of Cosines: (opposite leg)^2=(adjacent leg)^2+(other opposite leg)^2-2(leg)(leg)cos(angle in between)

Example: for a triangle with C=36 degrees a=5 b=6

c^2=5^2+6^2-2(5)(6)cos36

c=Square root of(25+36-2(5)(6)cos36)
c= 3.53

*The area of non-right triangle:

1/2(leg)(leg)sin(angle between)

Example: Triangle ABC has sides a=5 b=3 and C=40 degrees

= (1/2)(5)(3)(sin(40))

Goodluck on the exam!!!! :)