英语翻译一个环形的外圆直径是10cm,内圆直径是8cm,它的面积（ ） cm2.一个圆的半径扩大2倍,它的周长扩大（ ）

There is a ring,the diameter of the outer-circle is 10cm,and the diameter of the inner-circle in 8cm,therefore its surface area is ( )cm2.
If the radius of a circle is doubled,its circumference will be increased by ( ) times,and the surface area will be increased by ( ) times.

你的机器翻译似乎帮不到人家多少

朋友你好：
我想应该是这么翻译的：
The outer circle's diameter is 10cm. Inner circle circle 's diameter is 8cm ,its area is ____cm2. If a circle's radius exceeds 2 times, its diameter exceeds____times, its area exceeds_____times.
可能并不专业，请作个参考
希望能帮到你哦！：）