推荐回答(5个)
表面积:
圆锥的表面积由侧面积和底面积两部分组成。全面积(S)=S侧+S底 ,公式:
其中,S侧= ,S底=2πr^2。(r:底面半径,l:圆锥母线, :侧面展开图圆心角弧度)
其他公式:
1,高: (l:母线长,r:底面半径)
2,底面周长: (r:底面半径, :侧面展开图圆心角弧度,l:母线长)
3,圆锥体积公式: ,其中S是圆锥的底面积,h是圆锥的高,r是圆锥的底面半径。
扩展资料:
圆锥定义:
圆锥面和一个截它的平面(满足交线为圆)组成的空间几何图形叫圆锥。
以直角三角形的直角边所在直线为旋转轴,其余两边旋转而成的曲面所围成的几何体叫做圆锥。
注意:圆锥不是特殊的圆柱。
圆锥组成:
1,圆锥的高:圆锥的顶点到圆锥的底面圆心之间的最短距离叫做圆锥的高;
2,圆锥母线:圆锥的侧面展开形成的扇形的半径、底面圆周上任意一点到顶点的距离。
3,圆锥的侧面积:将圆锥的侧面沿母线展开,是一个扇形,这个扇形的弧长等于圆锥底面的周长,而扇形的半径等于圆锥的母线的长. 圆锥的侧面积就是弧长为圆锥底面的周长×母线/2;没展开时是一个曲面。
4,圆锥有一个底面、一个侧面、一个顶点、一条高、无数条母线,且底面展开图为一圆形,侧面展开图是扇形。
参考资料:百度百科----圆锥
已知:圆锥高h,底面半径r。
则表面积为:S=π r L,其中的L=√(h²+r²)
合计来就是:S=π r √(h²+r²) /派*半径*根号下(高平方+半径平方)/
圆锥的表面积=圆锥的侧面积+底面圆的面积
圆锥体的侧面积=πRL
圆锥体的表面积=πRL+πR^2
π为圆周率3.14
R为圆锥体底面圆的半径
L为圆锥的母线长(注意:不是圆锥的高)
圆锥的体积=1/3*πR^2h
(h:圆锥体的高)
请尊重我的劳动成果,请采纳!
圆锥展开是一个扇形,要想求圆锥的表面积,还必须得知道圆锥侧面展开扇形的圆心角是多少度.如果知道了圆心角就可以求出圆锥的表面积.
如果知道了圆心角的度数,面积就如下:
圆锥的表面积=底面积+圆锥的斜边的长度的平方x∏x(圆锥的度数/360)
底面积=底面半径的平方x∏
圆锥表面积公式:
s=1/2(l*r)=1/2(2π*R*r)(R为底面半径,r为圆锥半径)
圆锥表面积=二分之一乘底(底圆周长)乘高(圆锥母线)+3.14(圆周率)乘半径的平方
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