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Alexionutz2001
a fost răspuns

Daca AC=12 cm si tgC=1,25 , calculati AB, BC, sinB, cosB

Răspuns :

Eminonis
AD/DC=1,25
folosim teorema lui pitagora
AD↑2=12↑2-DC↑2=1144-DC↑2=>AD=√(144-DC↑2)
√(144-DC↑2)/DC=1,25
ridicam relatia la patrat
(144-DC↑2)/DC↑2=25/16
41DC↑2=2304
DC↑2=2304/41
DC=48/√41

Rebesor
sin C=AB/BC
3/5=AB/25
AB=25x3/5=15 cm
AC=√(25²-15²)=√(625-225)=√400=20 cm
cosB=AB/BC=15/25=3/5
tg C=AB/AC=15/20=3/4

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