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 result:

x =  100 cm2

Solution:

d=18 cm S1=d⋅ d=18⋅ 18=324 cm2  a=8 cm b=8 cm c=3 cm  S2=2⋅ (a⋅ b+a⋅ c+b⋅ c)=2⋅ (8⋅ 8+8⋅ 3+8⋅ 3)=224 cm2  x=S1−S2=324−224=100 cm2

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