tolong bantuan ya kak nomor 1 ,3,4,dan 8 pakek caranya ya pliss

1. L = ½ (a + b) × t
= ½ (29 + 11) × 4
= 80 cm²

2. L = (p × l) - (½ π r²)
= (14 × 22) - (½ ²²/7 × 7 × 7)
= 308 - 77
= 231 cm²