Răspuns:
Explicație pas cu pas:
πr^2 ........ 360 (un cerc)
x ............ n° ( un sector)
x = π*r^2*n°/360 = As = Aria sector cerc
<AOB este unghi la centru, m(<AOB)= m(arcAB)
a) arcAB = 30, As = π*64*30/360 = π*16/3
b) arcAB = 450, As = π*36*45/360 = π*9/2
c) arcAB = 60, As = π*144*60/360 = π*12/5
etc.
