Dibantu ya teman jangan lupa pakai cara jangan langsg jawaban&kalo ga bisa jawab ga usa jawab cman no 3.a,b

a) L = ( a + b / 2 ) x t
= ( 10 + 15 / 2 ) x 12
= ( 25 / 2 ) x 12
= 12,5 x 12
= 150 cm²

b) L = ( 32 + 12 / 2 ) x 15
= ( 44 / 2 ) x 15
= 22 x 15
= 330 cm²

Semoga Bermanfaat! {^=^}
Makasih:D