[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.60,0:00:02.53,Default,,0000,0000,0000,,在上一个视频中，我们讲了
Dialogue: 0,0:00:02.53,0:00:05.08,Default,,0000,0000,0000,,一个 30-60-90 的三角形的边长比
Dialogue: 0,0:00:05.08,0:00:06.68,Default,,0000,0000,0000,,是--如果我们假设最长的边是 x ，
Dialogue: 0,0:00:06.68,0:00:08.35,Default,,0000,0000,0000,,如果斜边是 x ，
Dialogue: 0,0:00:08.35,0:00:11.48,Default,,0000,0000,0000,,那么最短的边长就是 x/2，而这两个边之间的边，
Dialogue: 0,0:00:11.48,0:00:13.69,Default,,0000,0000,0000,,也就是60°角的对边，
Dialogue: 0,0:00:13.69,0:00:14.89,Default,,0000,0000,0000,,边长是 3x/2 的平方根。
Dialogue: 0,0:00:14.89,0:00:19.12,Default,,0000,0000,0000,,或者用另一种方法考虑，如果最短的边是 1，
Dialogue: 0,0:00:19.12,0:00:21.54,Default,,0000,0000,0000,,我先考虑最短的边，然后是长度居中的边，
Dialogue: 0,0:00:21.54,0:00:22.39,Default,,0000,0000,0000,,然后是最长的边。
Dialogue: 0,0:00:22.39,0:00:24.50,Default,,0000,0000,0000,,如果30°角对面的边长是 1，
Dialogue: 0,0:00:24.50,0:00:27.40,Default,,0000,0000,0000,,那么60°角对面的边长
Dialogue: 0,0:00:27.40,0:00:29.34,Default,,0000,0000,0000,,就是 它的3倍的平方根。
Dialogue: 0,0:00:29.34,0:00:31.11,Default,,0000,0000,0000,,它就是 3 的平方根。
Dialogue: 0,0:00:31.11,0:00:33.85,Default,,0000,0000,0000,,然后，斜边是它的2倍。
Dialogue: 0,0:00:33.85,0:00:35.48,Default,,0000,0000,0000,,上一个视频中，我们从 x 开始，
Dialogue: 0,0:00:35.48,0:00:37.46,Default,,0000,0000,0000,,我们说 30°对面的边是 x/2。
Dialogue: 0,0:00:37.46,0:00:40.11,Default,,0000,0000,0000,,但是，如果 30° 对面的边是 1，
Dialogue: 0,0:00:40.11,0:00:41.27,Default,,0000,0000,0000,,那么这条边就是它的 2倍。
Dialogue: 0,0:00:41.27,0:00:42.44,Default,,0000,0000,0000,,它就是 2。
Dialogue: 0,0:00:42.44,0:00:46.12,Default,,0000,0000,0000,,这里就是30°对面的边，
Dialogue: 0,0:00:46.12,0:00:49.44,Default,,0000,0000,0000,,60°对面的边，和斜边，也就是
Dialogue: 0,0:00:49.44,0:00:51.03,Default,,0000,0000,0000,,90°对面的边。
Dialogue: 0,0:00:51.03,0:00:53.80,Default,,0000,0000,0000,,一般来说，如果你看到
Dialogue: 0,0:00:53.80,0:00:56.57,Default,,0000,0000,0000,,任何三角形有这样的边长比，你就可以说，那是一个 30-60-90 的三角形。
Dialogue: 0,0:00:56.57,0:00:58.08,Default,,0000,0000,0000,,
Dialogue: 0,0:00:58.08,0:01:02.29,Default,,0000,0000,0000,,
Dialogue: 0,0:01:02.29,0:01:05.10,Default,,0000,0000,0000,,
Dialogue: 0,0:01:05.10,0:01:06.66,Default,,0000,0000,0000,,
Dialogue: 0,0:01:06.66,0:01:08.93,Default,,0000,0000,0000,,
Dialogue: 0,0:01:08.93,0:01:14.51,Default,,0000,0000,0000,,
Dialogue: 0,0:01:14.51,0:01:15.48,Default,,0000,0000,0000,,
Dialogue: 0,0:01:15.48,0:01:17.79,Default,,0000,0000,0000,,
Dialogue: 0,0:01:17.79,0:01:19.44,Default,,0000,0000,0000,,
Dialogue: 0,0:01:19.44,0:01:22.34,Default,,0000,0000,0000,,
Dialogue: 0,0:01:22.34,0:01:25.44,Default,,0000,0000,0000,,
Dialogue: 0,0:01:25.44,0:01:27.38,Default,,0000,0000,0000,,
Dialogue: 0,0:01:27.38,0:01:29.57,Default,,0000,0000,0000,,
Dialogue: 0,0:01:29.57,0:01:32.98,Default,,0000,0000,0000,,
Dialogue: 0,0:01:32.98,0:01:36.65,Default,,0000,0000,0000,,
Dialogue: 0,0:01:36.65,0:01:38.19,Default,,0000,0000,0000,,
Dialogue: 0,0:01:38.19,0:01:40.16,Default,,0000,0000,0000,,
Dialogue: 0,0:01:44.25,0:01:47.14,Default,,0000,0000,0000,,
Dialogue: 0,0:01:47.14,0:01:49.77,Default,,0000,0000,0000,,
Dialogue: 0,0:01:49.77,0:01:51.03,Default,,0000,0000,0000,,
Dialogue: 0,0:01:51.03,0:01:52.87,Default,,0000,0000,0000,,
Dialogue: 0,0:01:52.87,0:01:55.26,Default,,0000,0000,0000,,
Dialogue: 0,0:01:55.26,0:01:56.79,Default,,0000,0000,0000,,
Dialogue: 0,0:01:56.79,0:02:03.47,Default,,0000,0000,0000,,
Dialogue: 0,0:02:03.47,0:02:05.83,Default,,0000,0000,0000,,
Dialogue: 0,0:02:05.83,0:02:06.50,Default,,0000,0000,0000,,
Dialogue: 0,0:02:06.50,0:02:09.85,Default,,0000,0000,0000,,
Dialogue: 0,0:02:09.85,0:02:11.35,Default,,0000,0000,0000,,
Dialogue: 0,0:02:11.35,0:02:14.99,Default,,0000,0000,0000,,
Dialogue: 0,0:02:14.99,0:02:17.44,Default,,0000,0000,0000,,
Dialogue: 0,0:02:17.44,0:02:25.44,Default,,0000,0000,0000,,
Dialogue: 0,0:02:25.44,0:02:27.61,Default,,0000,0000,0000,,
Dialogue: 0,0:02:27.61,0:02:32.06,Default,,0000,0000,0000,,
Dialogue: 0,0:02:32.06,0:02:33.78,Default,,0000,0000,0000,,
Dialogue: 0,0:02:33.78,0:02:38.75,Default,,0000,0000,0000,,
Dialogue: 0,0:02:38.75,0:02:41.85,Default,,0000,0000,0000,,
Dialogue: 0,0:02:41.85,0:02:44.01,Default,,0000,0000,0000,,
Dialogue: 0,0:02:44.01,0:02:50.14,Default,,0000,0000,0000,,
Dialogue: 0,0:02:54.24,0:02:56.03,Default,,0000,0000,0000,,
Dialogue: 0,0:02:56.03,0:02:59.18,Default,,0000,0000,0000,,
Dialogue: 0,0:02:59.18,0:03:01.27,Default,,0000,0000,0000,,
Dialogue: 0,0:03:01.27,0:03:03.18,Default,,0000,0000,0000,,
Dialogue: 0,0:03:03.18,0:03:08.95,Default,,0000,0000,0000,,
Dialogue: 0,0:03:08.95,0:03:10.82,Default,,0000,0000,0000,,
Dialogue: 0,0:03:10.82,0:03:12.61,Default,,0000,0000,0000,,
Dialogue: 0,0:03:12.61,0:03:14.77,Default,,0000,0000,0000,,
Dialogue: 0,0:03:14.77,0:03:18.09,Default,,0000,0000,0000,,
Dialogue: 0,0:03:18.09,0:03:22.74,Default,,0000,0000,0000,,
Dialogue: 0,0:03:22.74,0:03:26.43,Default,,0000,0000,0000,,
Dialogue: 0,0:03:26.43,0:03:27.97,Default,,0000,0000,0000,,
Dialogue: 0,0:03:27.97,0:03:29.74,Default,,0000,0000,0000,,
Dialogue: 0,0:03:29.74,0:03:32.31,Default,,0000,0000,0000,,
Dialogue: 0,0:03:32.31,0:03:37.49,Default,,0000,0000,0000,,
Dialogue: 0,0:03:37.49,0:03:41.57,Default,,0000,0000,0000,,
Dialogue: 0,0:03:41.57,0:03:45.93,Default,,0000,0000,0000,,
Dialogue: 0,0:03:45.93,0:03:48.23,Default,,0000,0000,0000,,
Dialogue: 0,0:03:51.29,0:03:53.42,Default,,0000,0000,0000,,
Dialogue: 0,0:03:53.42,0:03:54.86,Default,,0000,0000,0000,,
Dialogue: 0,0:03:54.86,0:03:57.79,Default,,0000,0000,0000,,
Dialogue: 0,0:03:57.79,0:04:01.29,Default,,0000,0000,0000,,
Dialogue: 0,0:04:01.29,0:04:04.69,Default,,0000,0000,0000,,
Dialogue: 0,0:04:04.69,0:04:07.79,Default,,0000,0000,0000,,
Dialogue: 0,0:04:07.79,0:04:09.79,Default,,0000,0000,0000,,
Dialogue: 0,0:04:09.79,0:04:11.20,Default,,0000,0000,0000,,
Dialogue: 0,0:04:11.20,0:04:13.98,Default,,0000,0000,0000,,
Dialogue: 0,0:04:13.98,0:04:18.23,Default,,0000,0000,0000,,
Dialogue: 0,0:04:18.23,0:04:22.13,Default,,0000,0000,0000,,
Dialogue: 0,0:04:22.13,0:04:23.94,Default,,0000,0000,0000,,
Dialogue: 0,0:04:23.94,0:04:26.65,Default,,0000,0000,0000,,
Dialogue: 0,0:04:26.65,0:04:27.75,Default,,0000,0000,0000,,
Dialogue: 0,0:04:27.75,0:04:30.69,Default,,0000,0000,0000,,
Dialogue: 0,0:04:30.69,0:04:33.64,Default,,0000,0000,0000,,
Dialogue: 0,0:04:33.64,0:04:35.90,Default,,0000,0000,0000,,
Dialogue: 0,0:04:35.90,0:04:37.51,Default,,0000,0000,0000,,
Dialogue: 0,0:04:37.51,0:04:39.79,Default,,0000,0000,0000,,
Dialogue: 0,0:04:39.79,0:04:41.91,Default,,0000,0000,0000,,
Dialogue: 0,0:04:41.91,0:04:43.45,Default,,0000,0000,0000,,
Dialogue: 0,0:04:43.45,0:04:45.97,Default,,0000,0000,0000,,
Dialogue: 0,0:04:45.97,0:04:47.21,Default,,0000,0000,0000,,
Dialogue: 0,0:04:47.21,0:04:49.05,Default,,0000,0000,0000,,
Dialogue: 0,0:04:49.05,0:04:50.37,Default,,0000,0000,0000,,
Dialogue: 0,0:04:50.37,0:04:53.11,Default,,0000,0000,0000,,
Dialogue: 0,0:04:53.11,0:04:55.15,Default,,0000,0000,0000,,
Dialogue: 0,0:04:55.15,0:04:57.92,Default,,0000,0000,0000,,
Dialogue: 0,0:04:57.92,0:05:01.40,Default,,0000,0000,0000,,
Dialogue: 0,0:05:01.40,0:05:03.79,Default,,0000,0000,0000,,
Dialogue: 0,0:05:03.79,0:05:09.19,Default,,0000,0000,0000,,
Dialogue: 0,0:05:09.19,0:05:12.34,Default,,0000,0000,0000,,
Dialogue: 0,0:05:12.34,0:05:14.55,Default,,0000,0000,0000,,
Dialogue: 0,0:05:14.55,0:05:16.82,Default,,0000,0000,0000,,
Dialogue: 0,0:05:16.82,0:05:19.10,Default,,0000,0000,0000,,
Dialogue: 0,0:05:19.10,0:05:21.69,Default,,0000,0000,0000,,
Dialogue: 0,0:05:21.69,0:05:22.69,Default,,0000,0000,0000,,
Dialogue: 0,0:05:28.74,0:05:30.01,Default,,0000,0000,0000,,
Dialogue: 0,0:05:30.01,0:05:33.68,Default,,0000,0000,0000,,
Dialogue: 0,0:05:33.68,0:05:38.80,Default,,0000,0000,0000,,
Dialogue: 0,0:05:38.80,0:05:41.82,Default,,0000,0000,0000,,