工厂生产的一种环形垫片,内圆直径是5厘米,外圆直径是6厘米,求这种垫片的面积.
工厂生产的一种环形垫片,内圆直径是5厘米,外圆直径是6厘米,求这种垫片的面积.
数学人气:501 ℃时间:2020-01-29 05:32:44
优质解答
这种垫片的面积=外圆-内圆=3^2*π-2.5^2π=2.75π≈8.635平方厘米
我来回答
类似推荐
猜你喜欢
- 1自豪的意思
- 2Can you give me some paper ( ) me I want ( ) write a letter
- 3设函数f(x)=sin(wx+2π/3)+sin(wx-2π/3)(w>0)的最小正周期为π,求函数的单调区间?
- 4咏雪中未若柳絮因风起的比喻有什么好处
- 5his word made my blood boil 是什么意思(习惯用语)
- 6已知:a,b是正常数,x,y∈R*,且a+b=10,a/x+b/y=1,x+y的最小值为18,求a、b的值.
- 7I don't have to leave today.In fact,it_____as a direct result of Andy Roberts reorganizing my plan.A.occurs to B.comes a
- 8everyone can not answer this question.
- 9阅读下面的文言文短文,
- 10They have decided which hotel to stay at.