Kumaliza sentensi ifuatayo na chaguo bora: jinsi ya kupata mduara wa trapezoid  Chaguzi: - Perimeta = kuongeza urefu wa pande zote P = + b1 + b2 + c x b1 - Perimeta = kuongeza urefu wa pande zote P = + b1 + b2 + c  Jibu:
Mzunguko = kuongeza urefu wa pande zote P = a + b1 + b2 + c