, where s is length of a side; we have s = 2 + 4 + 2 = 8 mm; then area isΒ 
;
, where r is the radius of circle; r = 4/2 = 2 mm; then area is 2Ο;![16 \sqrt{3} - 2Ο = 2( [tex]8 \sqrt{3}](/tpl/images/0293/8591/1244a.png)
-Β Ο );Can you me with #20? in details i am so lost
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