tolong yah.. susah pr nya 2 - 3 .. pke cara yh.. poin nya lumayan lho

2) L1 = ½ × d1 × d2
= ½ × ( 10 + 10) × ( 10 + 4)
= ½ × 20 + 14
= 140 cm²
L2 = ½ × ( a + b ) × t
= ½ × ( 6 + 18) × 10
= ½ × 24 × 10
= 120 cm²
Lttl = 140 + 120 = 260 cm²

3) L1 = s²
= 23 × 23
= 529 cm²
L2 = ½ × a × t
= ½ × 12 × 23
= 138 cm²
Lttl = 529 + 138 = 667 cm²