Dau coroană! Îmi trebuie până la ora 13:00.
Răspunsuri la întrebare
1. sper ca stii sa desenezi
a)4×l²=4×3²=4×9=36 cm²
b)l³=3³=27 cm³
2. a)diagonala patrat=l×rad2=》 l=8
b)diagonala cubului=l×rad3
diagonala cub=8rad3
c)A=6×l²=6×8²=6×64=384
d)V=l³=8³=512
3. a) diagonala cub=l rad 3=》 l=6
b) A lat=4×l²=4×6²=4×36=144
c) A=6×l²=6×6²=6×36=216
d)V=l³=6³=216
4.a)12×l=60
l=5 cm
b)diagonala cub=l×rad 3
diagonala cub=5rad3
c)V=l³=5³=125cm³
d)A=6×l²=6×5²=6×25=150cm²
5. a)Af=l²=》 l=10cm
b)V=l³=10³=1000cm³
6. a)Al=4×Af=》 Af=100/4=25cm²
b) Af=l²=25=》 l=5
V=l³=5³=125cm³
7. a) At=6×Af=》 Af=294/6=49cm²
b)Af=l²=49=》 l=7 cm
c) Al=4×l²=4×49=196 cm²
d)V=l³=7³=343 cm³
8. a)V=l³=125=》 l=5cm
b)diagonala fata=l×rad2=5rad2
c)At=6×l²=6×5²=6×25=150cm²
d)diagonala cub=l×rad3=5rad3
9. a)MN linie mijlocie pentru triunghiul ABC
MN=BC/2=》BC=2×10RAD2=20RAD2
BC diagonala patrat=l×rad2=》 l=20 cm
b)V=l³=20³=8000cm³
c)aria triunghiului ACD'
AC=20RAD2
AD'=20RAD2
CD'=20rad2
deci acest triunghi este echilateral
A=(20rad2)²rad3/4
A=800rad3/4
A=200rad3 cm²
d)diagonala cub=l×rad3=20rad3 cm
10. a) A=l×l×rad2=36rad2《=》 l²=36, l=6cm
b) diagonala cub=l×rad3=6rad3
c)A=6×l²=6×6²=6×36=216 cm²
d)V=l³=6³=216cm³
11.a)diagonala patrat=l×rad2=》 l= d/rad2, l=12rad2/2=6rad2cm
b)V=l³=(6rad2)³=432 rad2 cm³
12. a) baza are 2 diagonale=l×rad2
l×rad2×l×rad2=288(eu asa vad)
2l²=288
l²=144
l=12cm
At=6×l²=6×12²=6×144=864cm²
V=l³=12³=1728cm³
b) MN=BC
BM=NC
unghiul ABM=unghiul DCN=30°
mmmm...la asta nu stiu...