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Problema MATEMATICA

 
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EuGENlol

[Mentally Stable]



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(since 01-11-2012 14:22)
Joined: 13 Oct 2012
Posts: 2, Topics: 2
Location: Romania

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Post Posted: 13-10-2012, 19:42:28 | Translate post to: ... (Click for more languages)

1) In triunghiul ABC, m(<B)=60 grade, AB=8V3 cm si AC = 12V2 cm. Aflati:
a) lungimea laturii BC a triunghilui
b) aria triunghiului ABC
c) distanta de la C la AB

2) Triunghiul echilateral cu inaltimea egala cu 8V3 cm are perimetrul egal cu ... cm
3) Patratul cu diagonala de 9V2 cm are perimetrul egal cu ... cm.

Daca se poate rezolvarea intreaga a problemelor, nu doar raspunsul, daca se poate scrise pe o foaie si facut poza

V=radical

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In2ition

[Globul de cristal]



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(since 30-04-2018 18:33)
Joined: 28 Aug 2006
Posts: 11769, Topics: 315
Location: Galati

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Post Posted: 14-10-2012, 01:14:52 | Translate post to: ... (Click for more languages)

1) Se mai putea face si cu teorema cosinusului. Dadea o ecuatie de gradul 2 si aflai BC direct. Daca vrei iti arat si metoda asta. La c), distanta este inaltimea de pe varf la latura. O afli din formula ariei ( egalezi aria aflata cu AD cu aria cu distanta ).

2) Triunghi echilateral -> inaltimea = mediana = mediatoare = bisectoare.

3) Diagonala formeaza 2 triunghiuri dreptunghic isoscele ( 90 - 45 - 45 grade ).






We stop looking for monsters under the bed when we realize they're inside of us.

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no really, dacã nu era așa țãrancã, și dacã era în bucurești, o luam de nevastã

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