In ▲STU , UT = 5 and m∠S= 21. Find SU to the nearest tenth.
SU=Adjecent UT=opposite TS=hypotenus 
It IS a right triangle since it has a hypoteneuse...
Use the COSINE function (opposite/adjacent)
Cos(21) = UT/SU = 5/SU
Solving:
SU = 5/cos(21) =5.356=5.4 to the nearest tenth
It IS a right triangle since it has a hypoteneuse...
Use the COSINE function (opposite/adjacent).....(oops this is tangent fxn)
Cos(21) = UT/SU = 5/SU
Solving:
SU = 5/cos(21) =5.356=5.4 to the nearest tenth
Dang...that is TOTALLY wrong....use the COTANGENT function (adjacent/opposite)
COT(21) = SU/UT
UT Cot(21) = SU = 13.0
Sorry.....!
