Answer:
512.02 cm²
Explanation:
The big rectangle in the middle from top to bottom measures
14 cm by (13 cm + 5 cm + 13.93 cm) = 31.93 cm
The two triangles on the sides add up to a rectangle measuring 13 cm by 5 cm.
surface area = 14 cm × 31.93 cm + 13 cm × 5 cm
surface area = 512.02 cm²