To find the surface area of a triangular prism, we need to calculate the area of each face and add them together.
Given that the triangular base of the prism is 8 cm by 6 cm, its area can be calculated using the formula for the area of a triangle:
Area of triangle = 0.5 * base * height
Area of triangular base = 0.5 * 8 * 6 = 24 cm²
Now, the lateral surface area of the prism will consist of two triangles with bases 8 cm and 9 cm and heights 10 cm and 6 cm respectively, and one with bases 9 cm and 6 cm and height of 8 cm.
Area of lateral surface = 2 * [0.5 * 8 * 10 + 0.5 * 9 * 6] + [0.5 * 9 * 8 + 0.5 * 6 * 10]
= 2 * [40 + 27] + [36 + 30]
= 2 * 67 + 66
= 134 + 66
= 200 cm²
Now, to find the total surface area, we will add the area of the base and the lateral surface:
Surface area = 24 + 200
= 224 cm²
Therefore, the surface area of the triangular prism is 224 cm².