Surface area 2

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

Correct answer:

p =  19 %

Step-by-step explanation:

q=100%10%=110010=0.9 S1 = a2 S2 = (q a)2 = q2 a2 = q2 S1  p = 100   S1 S1  S2  p = 100   S1 S1  q2 S1  p=100 11q2=100 111092=19%



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