Trigonometry / SOH CAH TOA Flashcards
1
Q
How do we calculate sides using the sin rule?
A
a. = b. = c
—- —- —-
Sin A. Sin B sin C
2
Q
How would we work out the length of side b if we are given
a= 5cm
c = 12cm
A = 45
A
a. = b. = c
—- —- —-
Sin A. Sin B sin C
3
Q
How do we find an angle with the sine rule?
A
a. = b. = c
—- —- —-
Sin A. Sin B sin C
then use sine -1
4
Q
How do we find the area of a non right angled triangle
A
A = 1/2 ab sin C
5
Q
How do we calculate a side with the cos rule?
A
a2 = b2+ c2 = 2b x c cos A
6
Q
How do we find the length of side a if we are given:
b= 4cm
c= 2cm
A= 56 degrees
A
a2 = b2+ c2 = 2b x c cos A
7
Q
How do we find an angle with the cos rule?
A
cos a = b2 + c2 -a2
—————
2bc
