tolong bantu no.6 lagi butuh ni

diameter = 70 cm
jari-jari = 70 : 2 = 35 cm
Luas lingkaran = [tex]\pi[/tex] x [tex]r^{2}[/tex] = [tex]\frac{22}{7}[/tex] x [tex]35^{2}[/tex] = 770 [tex]cm^{2}[/tex] (d)