Answer:
247 cm^2
Step-by-step explanation:
Lateral surfaces area = 10x9 + 9x5 + 9x8 = 207 cm^2
Base area = area of 2 triangles = bxh/2 + bxh/2 = 10x4/2 + 10x4/2 = 40 cm^2
Surface Area is the sum of above = 207 + 40 = 247 cm^2
