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In trapezul dreptunghic ABCD cu AB>DC,AB||CD, m(

Răspuns :

construim CEperpendicularpe AB⇒DC=AE=x
cum AB=DC⇒AB=2x⇒EB=x
ΔCEBdr⇒(TP)BC²=CE²+EB²⇒576=432+x²⇒x²=144⇒x=12, DC=12, AB=24
P ABCD=AB+BC+CD+AD=24+24+12+12√3=60+12√3=12(5+√3)