Prism surface calculation

Calculate the surface area of ​​a triangular prism with a height of 7 dm. Measures the edges of the triangular base
45 cm, 5 dm, 550 mm.

Final Answer:

S =  105 dm²

Step-by-step explanation:

$$\begin{gathered} h=7\text{dm} \\ a=45\text{cm}\to \text{dm}=45:10\text{dm}=4.5\text{dm} \\ b=5\text{dm} \\ c=550\text{mm}\to \text{dm}=550:100\text{dm}=5.5\text{dm} \\ o=a+b+c=4.5+5+5.5=15\text{dm} \\ S=o\cdot h=15\cdot 7=105{\text{dm}}^2 \end{gathered}$$

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