Right Triangles Trigonometry
B
a side
c side
A = 90 C
b side
To find angles
Unknown Formula     Unknown Formula    
C c / a = sine C 90 deg - B B b / a = sine B 90 deg - C
C b / a = cosine C 90 deg - B B c / a = cosine B 90 deg - C
C c / b = tan C 90 deg - B B b / c = tan B 90 deg - C
C b / c = cotan C 90 deg - B B c / b = cotan B 90 deg - C
C a / b = secant C 90 deg - B B a / c = secant B 90 deg - C
C a / c = cosec C 90 deg - B B a / b = cosec B 90 deg - C
To find sides
Unknown Formula        
a sqrt(b square + c square)    
a c x cosec C c / sine C  
a c x secant B c / cos B  
a b x cosec B b / sine B  
a b x secant C   b / cos C  
b sqrt(a square - c square)    
b a x sine B a / cosecant B
b a x cos C a / secant C
b c x tan B c / cotan B
b c x cotan C   c / tan C  
c sqrt(a square - b square)    
c a x cos B a / secant B
c a x sine C a / cosecant C
c b x cotan B b / tan B  
c b x tan C     b / cotan C