Respuesta :

Answer:

Supplementary angle sum is 90°

a+b=c

c=90°

Step-by-step:

according to question (A.T.Q.)

  • a-12=2c
  • 2c=a-12
  • c=a-12/2
  • since,
  • c=90°
  • 90=a-12/2
  • 90x2=a-12
  • 180+12=a
  • a=192