A = 0.5 x 4 cm x 1 cm = 2 cm 2. Triangle no. 5: base = 2 cm height = 3 cm ... 0.01 m = 0.1 dm = 1 cm = 10 mm ... 0.0001 m 2 = 0.01 dm 2 = 1 cm2 = 100 mm2
確定！ 回上一頁
