Răspuns:
Explicație pas cu pas:
5 a) h=l√3/2 h=8√3/2=4√3 cm
b) P=4l l=P:4=48:4=12 cm d=l√2=4√2 cm
c)d²=a²+4a² d=a√5
d) l²=(d1/2)²+(d2/2)² d1/2=2/2=1cm d2=2√3/2=√3
l²=1+3=4 l=2cm P=4x2=8 cm
6 AB²=AP²+PB²=360²+480²=360000 AB=600 m
BC=800-480=320m
CD=360-120=240 m
BD²=BC²+CD²=320²+240² BD=400 m
DR=120m
AD²=AR²+DR²=640000+14400 AD≅889m
A-B-D-A=AB+BD+DA=600+400+889=1889m =1,889km
1,889km >1,8 km
