圆锥展开为扇形,面积=1/2*半径*弧长,而半径=母线长,弧长=底面周长,
扇形面积=圆锥的侧面积=1/2*母线长*底面周长=底面周长×母线长÷2多谢。扇形面积=二分之一*半径*弧长懂了就明白了
猜你喜欢
- 1He is a young man of 25 years old= He is ( )( ) yong man .
- 21元和5角的硬币一共有50枚一共40元1元和5角的硬币各有多少枚
- 3证明:(1)(3π/2-α)=-cosα (2) (3π/2-α)=-sinα
- 4There will be a TV show about flowers tonight.[一般疑问句]
- 5I also could not live without you.i believe you what?Every minute and second,i believe you?What
- 6C的相对原子质量为什么会是12.01?
- 7应该是20 minutes' ride还是20 minutes ride还是20 minutes by bike还是20 minutes' by bike?
- 8求一篇介绍游戏《愤怒的小鸟》的英文文章!急用!
- 9已知反比例函数y=3-m/x,当m为何值时,1·函数的图像在二,四象限?
- 10已知集合A={x/ax^2+x+1=0,x属于R},且A∩{x/x≥0}=空集,求实数a的取值范围