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=500(pi) = 2(pi).r(r+t)
= 500 = 2.r(r+t)
= 500 = 2.2(2+t)
= 500 = 4. (2+t )
= 500 = 8 + 4t
= 4t = 500 - 8
= 4t = 492
= t = 492 : 4 = 123 cm2