Tolong dong pake cara y!!

trapesium = a+b ×t /2 = 10 + 20 = 30 × 14 = 420/2=210²
sagitiga = a×t/2 = 12×18 = 216/2 = 108cm²
gabungan = 210 + 108 = 318cm²
segitiga putih = a× t /2 × 2 = a× t = 12 ×8 = 96 cm²
luas yang diarsir = 318cm² - 96 cm²= 222 cm²