Răspuns :
6)aria= π R²
64π=π R²
R²=64
R=√64
R=8
diamentrul= 2 x raza= 2x8=16
7)raza = diametrul : 2
raza=4:2
=2
8)aria=4π²
r²=4
r=2
lungimea= 2Rπ
=2X2π
=4π
9) ARIA= 36 π
r²=36
r=√36
r=6
diametrul= 2 x r
=2x6
=12
64π=π R²
R²=64
R=√64
R=8
diamentrul= 2 x raza= 2x8=16
7)raza = diametrul : 2
raza=4:2
=2
8)aria=4π²
r²=4
r=2
lungimea= 2Rπ
=2X2π
=4π
9) ARIA= 36 π
r²=36
r=√36
r=6
diametrul= 2 x r
=2x6
=12
a)A=πR²
A=64π
πR²=64π
R²=64
R=8
b)d=4
d=2R
2R=4
R=2
c)A=4π
A=πR²
4π=πR²
R²=4
R=2
Lc=2πR
Lc=2*2π=4π
d)A=36π
A=πR²
πR²=36π
R²=36
R=6
d=2R
d=2*6
d=12
A=64π
πR²=64π
R²=64
R=8
b)d=4
d=2R
2R=4
R=2
c)A=4π
A=πR²
4π=πR²
R²=4
R=2
Lc=2πR
Lc=2*2π=4π
d)A=36π
A=πR²
πR²=36π
R²=36
R=6
d=2R
d=2*6
d=12