- (2021)基础几何 - 不规则形状的面积; Shmoop.com
https://www.shmoop.com/study-guides/math/basic-geometry/area-irregular-shapes
- (2021)百分比、比率和比例;她爱数学
https://www.shelovesmath.com/pre-algebra/percentages-ratios-and-proportions/
- (2020)如何计算百分比,作者:Lisa Maloney;Sciencing.com
https://sciencing.com/figure-out-percentages-5015963.html
- (2017)戴夫教授讲解的形状面积的计算;YouTube
https://www.youtube.com/watch?v=_zzV2DV19IU