13
AB=5 cm
BC=3 cm
AA'=4 cm
a) Afetei ABA'B' =4x5=20 cm²
b)Afetei ABCD=3x5=15 cm²
c)Afetei BCC'B'=3x4=12 cm²
d)Atotala = 2x20+2x15+2x12=2x(20+15+12)=2x47=94 cm²
e)[BC']=√(3²+4²)=√(9+16)=√25=5 cm
f)Ppatrulaterului ABC'D'=2x5+2x5=20 cm
14.
muchia=L=8 cm
a)Abaza =L²√3/4=8²√3/4=16√3 cm²
b)Afata laterala=8x8=64 cm²
c)Atotala = 3x64+2x16√3=192+32√3 cm²
16
a)Abaza =L²√3/4 =4√3
L²/4=4
L²=16
L=4 cm
b)Pbaza=4x3=12 cm
c) AB'=5
(AB')²=AB²+(BB')²
5²=4²+(BB')²
25=16+(BB')²
BB'=√(25-16)=√9=3 cm
d)Pfata laterala=2x(4+3)=2x7=14 cm
e)Afata laterala=3x4=12 cm²
f)Atotala=3x12+2x4√3=36+8√3 cm²
