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a²√3/4=4√3 /x4
a²√3=16√3 /:√3
a²=16
a=√16
a=4
h=a√3/2
h=4√3/2=2√3
ramie trapezu jest równe bokowi trójkata wiec wynosi 4
L=4 +4+4+4+4=20cm