Whakaoti mō r
r=45
Tohaina
Kua tāruatia ki te papatopenga
2r-15=75
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
2r=75+15
Me tāpiri te 15 ki ngā taha e rua.
2r=90
Tāpirihia te 75 ki te 15, ka 90.
r=\frac{90}{2}
Whakawehea ngā taha e rua ki te 2.
r=45
Whakawehea te 90 ki te 2, kia riro ko 45.
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