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Cine ma poate ajuta ex 11

Cine Ma Poate Ajuta Ex 11 class=

Răspuns :

[tex]Trebuie\ sa\ aflam\ toate\ unghiurile\ in\ functie\ de\ C:\\ \{A,B,C\} d.p.\{4,5,6\} \Rightarrow\frac{A}{4}=\frac{B}{5}=\frac{C}{6}\Rightarrow A=\frac{4C}{6}, B=\frac{5C}{6}\\ \\ \{C,D\} d.p. \{14,5\}\Rightarrow\frac{C}{14}=\frac{D}{5}\Rightarrow D=\frac{5C}{14}\\ A+B+C+D=360\\ \\ \frac{4C}{6}+\frac{5C}{6}+C+\frac{5C}{14}=360 |\cdot 42\\ \\ 28C+35C+42C+15C=15120\\ 120C=15120\Rightarrow \boxed{C=126}\\ A=\frac{4\cdot126}{6}=\boxed{84}\\ \\ B=\frac{5\cdot 126}{6}=\boxed{105}\\ \\ [/tex]
[tex]D=\frac{5\cdot 126}{14}=\boxed{45}[/tex]
Notez cu A masura unghiului A ,respectiv cu B,C, si D ale unghiurilor B,C,D  .                                                                                                          A=B=C                                                                                       4 5 6                                                                                                          C=D                                                                                          14  5                                                                                                                                                                                             Mai stiu ca suma unghiruilor intr-un patrulater este de 360 de grade.      A+B+C+D=360                                                                            Scot pe A,B si D in functie de C                                                                  A=4C                                                                                              6        B=5C                                                                                             6     C=5C                                                                                             14    Înlocuiesc  in    suma  si am:                                                     4C  +5C+5C+C=360                                                                   6     6     14        Aduc  la     accelasi   numitor:84                                                14*4C+14*5C+6*5C+84C  =360                                                                84                                                                             56C+7-C+30C+84C=360*84                                                     240C=360*84                                                                           C=360*84:240                                                                          C=126                                                                                        A=4*126:6=84     B=5*126:6=105                                                                        D=5*126:14=25