Answer:
x=2 meters
Explanation:
surface area=10 *(2.5+1.5+x)+2*1/2*1.5*x
=10(4+x)+1.5x
=40+10x+1.5x
=40+11.5x
now 40+11.5x=63
11.5x=63-40
11.5x=23
x=23/11.5=230/115=2
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