Two cubes each with side b are joined to form a cuboids. What is the surface area of this cuboids?
Choose the correct choice.
A) 12b^2  B) 10b^2  C) 6b^2  D) 4b^2  E) 2b^2
l=2b; b=b; h=b;   surface area=2*(lb+bh+hl)   =2*(2b^2+b^2+2b^2)   =10 b^2   ANSWER:10b^2
<result>B</result>
Two cubes each with side b are joined to form a cuboids. What is the surface area of this cuboids?