課堂談以下題目：
即是，有一對角相等及一對邊平行，則可得平行四邊形。理由：兩對對角相等。
之後我問：若有一對角相等及一對邊相等（見下圖），也可得平行四邊形嗎？
可以？還是不可？同學，自行探究一下吧：
https://www.geogebra.org/m/kHFgJV9h
今年不知有否同學仔做到以下題目：
In a quadrilateral ABCD, AC bisects DB, angle DAB = angle BCD. Is ABCD a parallelogram?
～完～
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