Heyy! ☺
Disc = Cerc
Știm despre diametru că este egal cu 2r, unde r = raza.
Aria unui cerc~
[tex]\pi \times {r}^{2} [/tex]
a) 8 m
r = D/2 = 8 m/2 = 4 m
A = πr² = π4² = 16 π m²
b) 6,(6) m = (66-6)/9 m = 60/9 m = 20/3 m
r = D/2 = (20/3)/2 = 20/3 × 1/2 = 10/3 m
A = πr² = π(10/3)² = 100/9 π m²
c) 3/ π m
r = D/2 = (3/ π)/2 = 3/ π × 1/2 = 3/ 2π
A = πr² = π(3/2π)²= 9 π/4 π² = 9/4 π m²
d) 2V11 m
r = D/2 = 2V11/2 = V11
A = πr² = π(V11)² = 11 π m²
