Cube-shaped 71414

Mother and daughter Susan are wrapping presents for father. Maťko has a cube-shaped box with dimensions of 9 cm, 3 cm, and 7 cm, and Zuzka has a box in the shape of a cube with an edge length of 3 cm. How many square cm of wrapping paper will they use in total if they need 20% more for overlap?

Correct answer:

S =  331.2 cm2

Step-by-step explanation:

a=9 cm b=3 cm c=7 cm  x=3 cm  S1=2 (a b+b c+c a)=2 (9 3+3 7+7 9)=222 cm2 S2=6 x2=6 32=54 cm2  q=100%+20%=1+10020=1.2  S=q S1+q S2=1.2 222+1.2 54=331.2 cm2



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