tolong bantu jawab pakai cara ya kak

1) △ AEC = △ ABE - △ ABC
= (a × t ÷ 2) - (a × t ÷ 2)
= (5 × 12 ÷ 2) - (5 × 4 ÷ 2)
= 30 - 10
= 20 cm

2) △ BCD = △ ADB - △ ABC
= (a × t ÷ 2) - (a × t ÷ 2)
= (5 × 8 ÷ 2) - (5 × 4 ÷ 2)
= 20 - 10
= 10 cm

3) Luas Arsir = △ AEC + △BCD
= 20 cm + 10 cm
= 30 cm² 

Jawabannya adalah B. 30 cm²