Surface area 2

Calculate how many % reduce the surface area of the cube is we reduced length of each edge by 10%.

Correct answer:

p =  19 %

Step-by-step explanation:

q=100%10%=110010=0.9 S1=a2 S2=(qa)2=q2 a2=q2 S1  p=100 S1S1S2  p=100 S1S1q2 S1  p=100 11q2=100 110.92=19%

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