Trig Flashcards
1
Q
CSC
A
Cscx = 1/sinx
sinx cannot be 0
2
Q
Sec
A
Secx = 1/cosx
cosx cannot be 0
3
Q
Cot
A
Cotx = 1/tanx
tanx cannot be 0
Cotx = cosx/sinx
4
Q
tanx
A
tanx= sinx/cosx
5
Q
Pythagorean
A
sin2x + cos2x = 1
6
Q
cot2x
A
1 + cot2x = csc2x
7
Q
tan2x
A
1 + tan2x = sec2x
8
Q
Sine law finding a side
A
a/Sina A = b/SinB = c/SinC
9
Q
Sine law finding an angle
A
SinA/a = SinB/b = Sinc/c
10
Q
Cosine law finding a side
A
a2 = b2 + c2 - 2bc cosA
11
Q
Cosine law finding an ankle
A
CosA = b2+c2-a2/2bc
12
Q
For a 30, 60, 90 triangle what are the side lengths?
A
hypotenuse is 2
Small side (height) is 1
other is root 3
13
Q
For 45 triangles what are the side lengths?
A
hypotenuse is 2
other two are root 2
OR
hypotenuse is root 2
other two sides are 1
14
Q
What criteria must be met for a triangle to be ambiguous?
A
- 1 angle and 2 sides must be given
- the angle must be across from smallest side
- angle must be less than 90 degrees
15
Q
What equation gives you height?
A
bsinA = h
