tolong dijelasin 1-4 yah.... please mau dikumpul nih

1) tembereng

2) diameter

3) diameter = 14 cm
a) jari-jari = ½ x d = ½ x 14 = 7 cm
b) Luas = 22/7 x 7 x 7 = 154 cm²

4) keliling = 88 m
a) diameter = 88 : 22/7 = (88x7)/22 = 28 m
jari-jari = ½ x 28 = 14 m

b) luas = 22/7 x 14 x 14 = 616 m²