1.
circular subject : round cup
radius : 2cm
diameter : 4cm
area : 12.56 [tex]cm^{2}[/tex]
solution: π·[tex]r^{2}[/tex] = 3•14 x 2 x 2 = 12.56
2.
circular subjects: round flowerpot
radius : 6cm
diameter : 12cm
area : 113.04 [tex]cm^{2}[/tex]
solution: π·[tex]r^{2}[/tex] = 3•14 x 6 x 6 = 113.04
