Answer:
Total surface area = 217 cm²
Explanation:
Area of Triangle = 1/2*b*h
Area of Triangle = 1/2 * 7 * 12 = 42 cm²
There are four triangular surfaces in the prism = 4 * 42 = 168 cm²
Area of the base square = S² = 7 x 7 = 49 cm²
Total surface area = Area of the base square + Area of 4 triangular surfaces
Total surface area = 49 cm² + 168 cm²
Total surface area = 217 cm²