Maths (P.5)

Using formula: Area of trapezium = (sum of two parallel sides) × (height) / 2

Now:

50 cm² = (20 cm) × (height) / 2

height = 5 cm

So the height is 5 cm.



2007-01-14 13:33:51 補充：
回應你的補充：如果你不需要代數，你可以用算式：height= (50cm²) × 2 ÷ (20 cm)= 5 cm

２０ａ ÷２＝５０
１０ａ＝５０
　　ａ＝５

The height is 2.5cm

2007-01-14 13:23:55 補充：
Area = [(sum of the two parallel sides) h]/250 = (20h)/2100 = 20hh = 5The height is 5cm.(Sorry...It's not 2.5cm)