Answer:
1544 m³
Step-by-step explanation:
surface area = 2 × base + lateral area
base = (10×20)÷2 = 100
Lateral area = perimeter × height
= (20+14+14)×28
=1 344
Final answer :
surface area = 2 × base + lateral area
= 2 × 100 + 1344
= 200 + 1344
= 1544
