投影幕布尺寸计算?

4:3:长=对角线×0.8,宽=对角线×0.6
16:9:长=对角线×0.8716,宽=对角线×0.4903

例：50寸幕,长=50×0.8716=43.58英寸=43.58×2.54=110.6932(cm)
宽=50×0.4903=24.515英寸=24.515×2.54=62.2681(cm)