>
数学
>
已知:如图,同心圆O,大圆的弦AB=CD,且AB是小圆的切线,切点为E.求证:CD是小圆的切线.
人气:133 ℃ 时间:2019-12-13 03:16:56
解答
证明:如右图所示,连结OE,过O作OF⊥CD于F.
∵AB与小⊙O切于点E,
∴OE⊥AB,
∵AB=CD,
∴OE=OF(同圆等弦的弦心距相等),
∴CD与小⊙O相切.
推荐
已知:如图,同心圆O,大圆的弦AB=CD,且AB是小圆的切线,切点为E.求证:CD是小圆的切线.
已知:如图,同心圆O,大圆的弦AB=CD,且AB是小圆的切线,切点为E.求证:CD是小圆的切线.
如图,以点O为圆心的两个同心圆中,大圆的弦AB是小圆的切线,点P为切点.求证:AP=BP.
如图,以点O为圆心的两个同心圆中,大圆的弦AB是小圆的切线,点P为切点.求证:AP=BP.
如图,以点O为圆心的两个同心圆中,大圆的弦AB是小圆的切线,点P为切点.求证:AP=BP.
有两根同样长的绳子,第一根减去16米,第二根减去3.5米,第二根的长度是第一根的1.2倍,原来两根绳子各长
已知2/3x3m-1y3与-1/4x5y2n+1是同类项,则5m+3n的值是_.
_____has been very coled this year.
猜你喜欢
Every few ____ along the Great Wall there are some watch towers.
53.No sooner had he sat down to lunch than there was a knock at the door.为什么用than.而不是when
钠能与乙酸发生反应么?
各类服装【英文】和TOMATOPOTATO的复数
将一杯热水倒入容器内的冷水中,冷水温度升高10℃,又向容器内倒入同样一杯热水,冷水温度又升高6℃,若再向容器内倒入同样一杯热水,则冷水温度将再升高(不计热损失)( ) A.4
1的平方+2的平方+3的平方+.+N的平方,求计算过程及结果
The oranges in the fruit store and good cleap [as ,or,with ,as well as]
遵守公德尊重自然的行为原因是什么核心是什么?
© 2024 79432.Com All Rights Reserved.
电脑版
|
手机版