Whakamutua te rerenga e whai ake nei ki te kōwhiringa pai: me pēhea te kimi i te tawhiti o te trapezoid  Ngā kōwhiringa: - Tawhiti = tāpiri roa o ngā taha katoa P = he + b1 + b2 + c x b1 - Tawhiti = tāpiri roa o ngā taha katoa P = he + b1 + b2 + c  Whakautu:
Pātata = tāpiri roa o ngā taha katoa P = he + b1 + b2 + c