Question 1021592
2 rectangles are 20 by 40 = 2*800 = 1600 sq cm
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The lateral area of a cylinder = {{{2pi*r*h = 1600pi}}}
Each end is {{{pi*r^2 = 400pi}}}
{{{400pi + 1600pi = 2000pi}}} for a complete cylinder
This part is {{{(40/360)*2000pi = 2000pi/9}}} sq cm
Total = {{{1600 + 2000pi/9}}} sq cm