Tolongg djawabb yaa kakkkk no 3-5

1 . rumus luas lingkaran =22/7 ×r×r
r=diameter :2.
r=1,4m jadikan cm
r=1,4m×100=140cm
r=140cm:2=70cm
luas lingkaran= 22/7×70×70
70 :7 = 10×22=220×70=100400040405. 400