tolong di jawab plis!!!

1. a. L1 = a × t ÷ 2= 40 × 15 ÷ 2 = 300 cm ²
L2 = p × l = 30 × 40 = 1200 cm²
LD = 1500 cm²

b. L1 = a × t ÷ 2 = 16 × 10 ÷ 2 = 80 cm²
L2 = a × t ÷ 2 = 16 × 10 ÷ 2 = 80 cm²
L3 = p × l = 30 × 8 = 240 cm²
LD = 400 cm²

2. L1 = a × t ÷ 2 = 4 × 6 ÷ 2 = 12 cm²
L2 = (a+b) × t ÷ 2 = (20+12) × 6 ÷ 2 = 32 × 6 ÷ 2 = 96 cm²
L3 = (a+b) × t ÷ 2 = (24+12) × 6 ÷ 2 = 36 × 6 ÷ 2 = 108 cm²

12 + 96 + 108 = 0,012 + 0,096 + 0,108 = 0,216 , 2500 ÷ 8 = 312,5 ÷ 0,216 = 1.446,759

3. 8 × 10 = 80 cm²

4.a. 30 × 2 = 60 cm
b. 3,14 × 60 = 188,4 cm
c. 30 × 100 = 3000 cm : 100.000 = 0,03 km²

5. L1 = 2 × 2 = 4 m²
L2 = 3 × 2 = 6 m²
LD = 10 m²

maaf kalau ada yang salah