tolong dijawab pliss butuh juga pakai caranya yaa

11.
jarak = 3,14 x 50 x 2.000 = 314.000 cm = 314.000/100.000 = 3,14 km

12.
keliling = 22/7 x 56 = 176 cm

13.
ABC = 180 - 78/2 = 141°

14.
OAB = 75°/60° x 72 = 5/4 x 72 = 90 cm²