If<A is the reference angle which sides is opposite <A

Answer 1

rsinA = hypotenuse times opposite side over hypotenuse = opposite side, opposite angle A

that's polar coordinates (A, rsinA)

convert to rectangular coordinates, (x,y)

= y = the y coordinate of the terminal point

or using the law of cosines

=a = sqr(c^2-b^2 -2bcCosA) where c= hypotenuse, b =adjacent side,

a = side opposite anlge A

or using law of sines

a= bsinA/sinB

a = csinA/sinC

let C = the right angle then

a=csinA which is basically the polar coordinate =(A, rsinA)

although A is a reference angle, and could mean A+360n where n= any integer or

other angles such as 180+/-A or -A

convention is to use a small letter as the side opposite an angle with a capital letter

a is opposite angle A

b is opposite angle B

c is opposite angle C