tolong ya Kawabata cpt

19 x 11,5 = 218,5 inci

5. a=11.5 inci
c= 19 inci
b=?

b²=c²-a²
  =19²-11.5²
  =361-132.25
b²= 228.75
b=√228.75
b= 15.12 inchi

lebar layar = 15.12 inci