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ex 1 subpunctul c.
Va rogg! Dau coroana!! :)


Ex 1 Subpunctul C Va Rogg Dau Coroana class=

Răspuns :

∡A=90
cos a1=2/3    cosa2=1/3    2/3+1/3=3/3=90°
CD=2/3*6=4   BD=1/3*6=2
AC²=CD*CB=4*6=24
AC=√24=2√6
AB²=DB*BC=2*6=12
AB=√12=2√3
AD²=CD*DB=4*2=8
AD=√8=2√2
ctg a2=AD/AB=2√2/2√3=√2/√3=√6/3
a2=√6/3=2,44/3=0,816