tolong di bantu ya besok di kumpul beserta caranya

Lingkaran
diameter ( d) = 28 cm
jari-jari ( r) = 1/2 × 28 = 14 cm
π = 22/7
Keliling lingkaran = 2× π × r
= 2 × 22/7 × 14
= 88 cm
4 buah lingkaran
6r = 6 × 14 = 84 cm
panjang tali minimum = 6r + keliling lingkaran
= 6× 14 + 88
= 172 cm