tolong di jawab dengan rumus

D = phi ÷ L
= 22/7 ÷ 1,54
= 4,84 cm

MAAF KALAU SALAH.......

l = 1,54 dm^2 = 154 cm^2

l = phi . r . r
154 = 22/7 . r . r
154 x 7 = 22. r . r
1078 = 22 . r . r
1078/ 22 = r . r
49 = r^2
r = 7


diameter = 2x jari2
d = 7x 2
d = 14cm