the measure of two supplementary angles, <S and <T, are in the ratio 7:3. find the value of m<S​

  example you can find the perimeter by addig all of its respective sides as such: (12+x)+(12+x)+(7+y)+(7+y).  adding like terms will result in   2x+2y+38    if you chose  xy+7x+12y+84, you multiplied the two sides to find the area.  if you chose  x+y+19

1) 11, because it's a perfect square.2) 4√3