Question

ex 19 si 21 plsss dau coroana +15 pct

Answer 1

19.

A_ABC=A/2=96/2=48 cm²

fie BI⊥AC=>BI inaltime in Δ ABC

A_ABC=AC*BI/2=>BI=2*A_ABC/AC=2*48/10=96/10=48/5 cm

21.

fie OM⊥AB=>OM inaltime in ΔABO

AM=MB=OM=AB/2

AC=DB=AB√2

A_ABO=AB*OM/2<=>15=AB²/2/2<=>AB²=15*4=60=>AB=√60=2√15 cm

A_ABCD=AB²=(2√15)²=4*15=60 cm²