P*r
4 楼
这表述也太不严密了吧
是不是,
过。。。。作另一个单位园,使两圆公共部分的 面积 是单位园的一半?
要求尺规作图?
[email protected]@=pi/2
@为圆心到公共弦张角
【在 B******O 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 单位元圆周上任意一点做一个园,怎样才能使得两元共同的部分是单位元的一半?
是不是,
过。。。。作另一个单位园,使两圆公共部分的 面积 是单位园的一半?
要求尺规作图?
[email protected]@=pi/2
@为圆心到公共弦张角
【在 B******O 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 单位元圆周上任意一点做一个园,怎样才能使得两元共同的部分是单位元的一半?
B*O
5 楼
给出另外一个圆(均分单位圆的)的半径。
【在 P*****r 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 这表述也太不严密了吧
: 是不是,
: 过。。。。作另一个单位园,使两圆公共部分的 面积 是单位园的一半?
: 要求尺规作图?
: [email protected]@=pi/2
: @为圆心到公共弦张角
【在 P*****r 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 这表述也太不严密了吧
: 是不是,
: 过。。。。作另一个单位园,使两圆公共部分的 面积 是单位园的一半?
: 要求尺规作图?
: [email protected]@=pi/2
: @为圆心到公共弦张角
f*y
9 楼
I can figure out a way to do it,but the algebra is kind of tedious.
o*g
10 楼
还没给出结果?等好几天了:)
B*O
14 楼
从别的地方copy过来的。
Let L denote the length of the leash. Let O be the center of the grass
circle, and Q the location where the leash is fastened. Let P and P' be the
two points on the circumference of the grass circle at distance L from Q.
Let B denote the measure of angle PQO in radians, and (C = π - 2B) the
measure of POQ. Because PQO is isosceles, we have L = 2 R cos B. The pie-
shaped region emanating from O and reaching from P to P' has area (1/2) R2 (
2C) = R2 C. The pie-shaped region emanating
【在 o**g 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 还没给出结果?等好几天了:)
Let L denote the length of the leash. Let O be the center of the grass
circle, and Q the location where the leash is fastened. Let P and P' be the
two points on the circumference of the grass circle at distance L from Q.
Let B denote the measure of angle PQO in radians, and (C = π - 2B) the
measure of POQ. Because PQO is isosceles, we have L = 2 R cos B. The pie-
shaped region emanating from O and reaching from P to P' has area (1/2) R2 (
2C) = R2 C. The pie-shaped region emanating
【在 o**g 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 还没给出结果?等好几天了:)
e*y
15 楼
我也列出了相同的式子
不过没有代数解,懒得算了
the
(
P'
/2
【在 B******O 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 从别的地方copy过来的。
: Let L denote the length of the leash. Let O be the center of the grass
: circle, and Q the location where the leash is fastened. Let P and P' be the
: two points on the circumference of the grass circle at distance L from Q.
: Let B denote the measure of angle PQO in radians, and (C = π - 2B) the
: measure of POQ. Because PQO is isosceles, we have L = 2 R cos B. The pie-
: shaped region emanating from O and reaching from P to P' has area (1/2) R2 (
: 2C) = R2 C. The pie-shaped region emanating
不过没有代数解,懒得算了
the
(
P'
/2
【在 B******O 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 从别的地方copy过来的。
: Let L denote the length of the leash. Let O be the center of the grass
: circle, and Q the location where the leash is fastened. Let P and P' be the
: two points on the circumference of the grass circle at distance L from Q.
: Let B denote the measure of angle PQO in radians, and (C = π - 2B) the
: measure of POQ. Because PQO is isosceles, we have L = 2 R cos B. The pie-
: shaped region emanating from O and reaching from P to P' has area (1/2) R2 (
: 2C) = R2 C. The pie-shaped region emanating
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