Question

Va rog , ma puteti ajuta si pe mine la exercitiile 15 , 16 si 17 . Urgent

Answer 1

15)tgB=AC/AB=6/6√3=1/√3⇒B=30gr    C=60 gr  AC=BC/2(teorema 30-60gr)⇒
BC=12cm
16)sinC=AB/BC=12/24=1/2⇒C=30gr  b=60gr   AC³=24³-12³=576-144=432=144*3
AC=12√3cm
17)T.Inaltimii⇒AD³=DB*DC    64=4*DC   DC=16 cm   BC=16+4=20 cm
T catetei⇒AC³=CD*BC=4*20 =80   AC=√80=4√5cm si  AC³=16*20=320  AC=8√5cm  sinB+sinC=AC/BC+AB/BC=8√5/20+4√5/20=16√5/20=4√5/5