Tolong dijawab ya soal nomer 26 dan 28 pake caranya yaa

26.
v = πr^2.t
1540=3,14.r^2.10
1540=31,4r^2
r^2=1540/31,4
r^2=49
r=√49
r= 7

28.
120 m = 12000 cm
skala 3000cm
12000/3000= 4cm