The surface area

How much percent will the surface area of a 4x5x8 cm block increase if the length of the shortest edge is increased by 2 cm?

Correct result:

p =  28.2609 %

Solution:

a=4 cm b=5 cm c=8 cm  a1=2+a=2+4=6 cm  S1=2 (a b+b c+c a)=2 (4 5+5 8+8 4)=184 cm2 S2=2 (a1 b+b c+c a1)=2 (6 5+5 8+8 6)=236 cm2  p=100 S2S1S1=100 236184184=65023=28.2609%



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