Решение и ответ во вложении.
BH - высота
EB=BC=CD=x
EH=(ED-BC)/2 =(4-x)/2
EH/EB = cosE
(4-x)/2x =cos55 <=> x =4/(2cos55 +1) ~1,86
P(EBCD)= 3x +4 =9,59
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Решение и ответ во вложении.
Verified answer
BH - высота
EB=BC=CD=x
EH=(ED-BC)/2 =(4-x)/2
EH/EB = cosE
(4-x)/2x =cos55 <=> x =4/(2cos55 +1) ~1,86
P(EBCD)= 3x +4 =9,59