Tīpoka ki ngā ihirangi matua
Whakaoti mō x
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

2x=180-90
Tangohia te 90 mai i ngā taha e rua.
2x=90
Tangohia te 90 i te 180, ka 90.
x=\frac{90}{2}
Whakawehea ngā taha e rua ki te 2.
x=45
Whakawehea te 90 ki te 2, kia riro ko 45.