tolong donk kakak yg baek,tolong jawab no.3 ya kakak jawab yg bnr

p = 11 cm
l = 3 cm

Keliling persegi panjang
= 2p + 2l
= 2 (11) + 2 (3)
= 22 + 6
= 28 cm

rumus = 2 × (p+l)

= 2 × ( 11 cm + 3 cm)
= 2 × 14 cm
= 28 cm

semoga membantu :)