Present

Gift box has a rectangular shape with dimensions of 8×8×3 cm. Miloslav wants to cover with square paper with sides of 18 cm. How much paper left him?

Correct answer:

x =  100 cm²

Step-by-step explanation:

$$\begin{gathered} d=18\text{ cm } \\ {S}_1=d\cdot d=18\cdot 18=324{\text{cm}}^2 \\ a=8\text{ cm } \\ b=8\text{ cm } \\ c=3\text{ cm } \\ {S}_2=2\cdot (a\cdot b+a\cdot c+b\cdot c)=2\cdot (8\cdot 8+8\cdot 3+8\cdot 3)=224{\text{cm}}^2 \\ x=S_1-S_2=324-224=100{\text{cm}}^2 \end{gathered}$$

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