Whakaoti mō r
r=10
Tohaina
Kua tāruatia ki te papatopenga
20=2r
Me whakakore te \pi ki ngā taha e rua.
\frac{20}{2}=r
Whakawehea ngā taha e rua ki te 2.
10=r
Whakawehea te 20 ki te 2, kia riro ko 10.
r=10
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
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