• 14、Thank you very much for taking me with you on that splendid outing to London. It was the first time that I had seen the Tower or any of the other famous sights. If I'd gone alone, I couldn't have seen nearly as much, because I wouldn't have known my way about.
5m
5m
b
2m
图形的面积是:
3m
a 3m
(5+3+5)m
b
2m
a+ b 3 ×3 + ( 5 + 3 + 5 ) ×2 = 9 + 26 = 35 (m2)
计算图形的面积
6 cm 4 cm
5 cm
10 cm
图形的面积是:
a–b 10 x 9 – 4 x 4 = 90 + 16 = 74 (cm2)
长方形正方形 面积周长计算
长方形的面积=长×宽 周长=(长+宽)×2 正方形的面积=边长×边长 周长=边长×4
简单的换算:
1平方米=100平方分米 1平方分米=100平方厘米
1平方米=10000平方厘米
千米
1000 米 10
10
10
分米
厘米 毫米
除了千米和米之间的进率是1000,其他 相邻两个面积长度单位间的进率都是10。
面积 :物体表面或平面图形的大小叫做它们的面积。
面积单位