tolong dijawab pertanyaan nya

TP1= 288 TP2= 108 TP3= 372

a. L = ½ × (a+b) × t
= ½ × (12+20) × 18
= ½ × 32× 18
= 16 × 18
= 288 cm²

b. L = ½ × (a+b) × t
= ½ × (5+8) × 12
= ½ × 13 × 12
= 13 × 6
= 78 cm²

c. t = √13²-5²
= 12
L = ½ × (a+b) × t
= ½ × (16+18) × 12
= ½ × 34 × 12
= 34 × 6
= 204 cm²