Surface area

Calculate the surface area of a four-sides 2-m high prism which base is a rectangle with sides 17 cm and 1.3 dm

Correct answer:

S =  16.42 dm²

Step-by-step explanation:

$$\begin{gathered} c=2\text{ dm } \\ a=17\mathrm{/}10={\displaystyle \frac{17}{10}}=1.7\text{ dm } \\ b=1.3\text{ dm } \\ S=2\cdot (a\cdot b+b\cdot c+a\cdot c)=2\cdot (1.7\cdot 1.3+1.3\cdot 2+1.7\cdot 2)={\displaystyle \frac{821}{50}}={\displaystyle \frac{821}{50}}{\text{dm}}^2=16.42{\text{dm}}^2 \end{gathered}$$

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