Formulas
The formula for law of sines (two pieces is fine)
sinB sinA sinC
---- = ----- = ------
b a c
The law of sines can be used on this type of triangle (one of three)
What is SAA
The law of cosines can be used on this type of triangle (one of two)
What is SSS
What quadrant(s) is Cosine positive in?
The formula associated with b for law of cosines
b2 = a2 + c2 - 2accosB
The placement of lowercase letters goes with what
What is the sides of the triangle
The next step after the law of cosines is used to finish solving the triangle
What is using the law of sines
After the law of sines is setup, what is a step used to solve it
Cross multiplying, multiplying on both sides, canceling out......
The formula associated with c for law of cosines
c2 = a2 + b2 - 2abcosC
The function used when finding an angle measure in law of sines
What is the inverse sine function
The first step in using the law of cosines (SSS triangle)
What is finding the side opposite the angle given
What are both the law of sines and cosines used for?
Finding missing angles and sides
The formula associated with a for law cosines
a2 = b2 + c2 - 2bccosA
The solution for side b=?, when B=78', A=58', and a=33
What is 38
True or False: The Cosine function has the same range as the Sine function?
True
No triangle can have two of these angles. AND a triangle has to add up to this degree.
Obtuse and 180
The formula used to find just cosB from the law of cosines
-b2 + a2 + c2
--------------------- = cosB
2ac
What is the range of the Sine function? AND has a positive efunction value in what quadrants?
Range is from -1 to 1
Lies in Q1 and Q2
The solution for angle C=? when b=10, a=15, and c=19
What is 96.90
Sketch the graph of Cosine
On the board