Ngā Kāwai: Rauemi Wewete

Te aro motuhake:
Ko te whanui ko te whanui papatahi o te kiriata PVC. Hei tātai i te diameter o te ringaringa, tirohia te tauira e whai ake nei:
Diameter=Whanui whariki x2/3.14
Hei tauira, ko te whanui papatahi he 90mm, ā, he 57mm pea te diameter (90×2/3.14 ≈ 57)