Question

Un triunghi ABC are m(<B)=90°, m(<C)=30°, AB=5 cm. Determinati lungimea lui[BC]​

Answer 1

Răspuns:

A

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B__________________C

AC=2AB (AB cateta opusă < 30°)

AC=10 cm

t.Pitagora : BC^2 = AC^2 - AB^2

BC^2 = (10-5)(10+5) = 5•15 = 75 =>BC=5rad3 cm