Question

Va rog am nevoie azi de răspunsuri

Answer 1

Răspuns:

5. CR= 360m   DR= 120 m => CD= 360-120= 240 m  CD=240 m

AR=CP=800 m    PB=480 => CB= 800-480= 320m   CB=320 m

AP=CR=360m

AB= $\sqrt{PB^{2} +AP^{2} }$= $\sqrt{480^{2} +360^{2} }$= $\sqrt{230400+129600 }$= $\sqrt{360000}$=600 m

BD= $\sqrt{BC^{2} +CD^{2} }$= $\sqrt{320^{2} +240^{2} }$= $\sqrt{102400+ 57600} =\sqrt{160000}$= 400 m

AD= $\sqrt{x} \sqrt{800^{2} +120^{2} } = \sqrt{640000+14400} = \sqrt{654400} =808,9$ m

400+600+809=1809 m =1,809 km

6. m(A)=90   m(B)=60   m(C)=30   BC=6 cm

P=AB+BC+AC

sin 60=$\frac{AC}{BC}$   => AC= BC*sin 60= 6*$\sqrt{3}$/2= 3$\sqrt{3}$

cos 60= $\frac{AB}{BC}$  => AB= BC*cos 60= $\frac{1}{2}$ *6= 6:2= 3 cm

AC= 3$\sqrt{3}$   AB= 3 cm

AC+AB+BC= 6+3+3$\sqrt{3}$=9+3$\sqrt{3}$ cm (perimetru