please tolong dijawab no. 4 ya pake cara!!

a) K = 3 × s
= 3 × (2x)
= 6x

b) K = 6 × s
= 6 × (3y)
= 18y

a. keliling segitiga sama sisi
sisi = 2x
keliling = 3s = 3(2x) = 6x

b keliling segi enam beraturan
sisi = 3y
keliling = 6s = 6(3y) = 18y

semoga membantu