Tolong jawab soal diatas

maaf kalau salah
maaf kalau nggak ngerti

P = 5/3 × 18
= 5 × 18/3
= 5 x 6 = 30 cm

T = 2/3 × 30
= 2 × 30/3
= 2 × 10 = 20

jadi panjang balok tsb 20 cm