Помагитеее!!!!!!!!!!

Question

Помагитеее!!!!!!!!!!

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Answer 1

Sabc= 1/2*AB*BC*sin45; Sabc=8√2
Sabcd=AD*h AD=BC=4 h=√(CD^2-(AD/2)^2)
h=√(64-4)=√60. Sabcd=4√60=16√15