To complete the formula for the surface area of a triangular prism, we can recognize that the surface area (S.A) is made up of the areas of the two triangular bases and the three rectangular faces.
The general formula for the surface area of a triangular prism is:
\[ \text{S.A} = 2 \times \text{Area of triangular base} + \text{Area of rectangular faces} \]
Using \(S_1, S_2, S_3\) to denote the side lengths of the triangle, the formula can be expressed as:
\[ \text{S.A} = 2 \times \text{Area of triangle} + (S_1 + S_2 + S_3) \times h \]
Here:
- \(h\) is the height (length) of the prism.
- The term \(S_1 + S_2 + S_3\) would contribute to the total area of the three rectangular sides.
Given your prompt, the completed formula can look something like this:
\[ \text{S.A} = 2 \times \text{Area} + (S_1 + S_2 + S_3) \times h \]
If you want to fill the blanks in your specific way, based on context:
\[ \text{S.A} = 2 \times \text{Area} + (S_1 + S_2 + S_3) \cdot h \]
So, the filled blanks are:
- First blank: \(2 \times \text{Area}\) (representing the areas of the two triangular bases).
- Second blank: \( \cdot h \) (to indicate multiplication by the height of the prism).
Please confirm if you wanted a different approach or specific values or terms used in the blanks!