Question

problelma 6 si 7 din poza

Answer 1

Răspuns:

Explicație pas cu pas:

   

Answer 2

$\bf 7.\\ \\ \it a)\ \ m(\stackrel\frown{AB})=360^o:3=120^o \Rightarrow L_{\stackrel\frown{AB}} =\dfrac{2\pi\cdot12\cdot120^o}{360^o}=8\pi\ cm\\ \\ b)\ \ m(\stackrel\frown{AB})=360^o:4=90^o\Rightarrow L_{\stackrel\frown{AB}} =\dfrac{2\pi\cdot12\cdot90^o}{360^o}=6\pi\ cm\\ \\ c)\ \ m(\stackrel\frown{AB})=360^o:6=60^o\Rightarrow L_{\stackrel\frown{AB}} =4\pi\ cm\\ \\ d)\ \ m(\stackrel\frown{AB})=360^o:8=45^o \Rightarrow L_{\stackrel\frown{AB}} =3\pi\ cm$

$\it L_{\stackrel\frown{AB}} =\dfrac{2\pi R\cdot u}{360^o}$