题目内容：

100分求英文翻译,求手工
A helium balloon is rising vertically above point A that is located on level ground directly
underneath the balloon. As it rises for a time period of 1 minute, its angle of elevation from a
point B on the ground that is located 180 meters from point A changes from 13 degrees to 65
degrees. How far does the balloon rise during this period of time? Approximate your answer to
the nearest tenth of a meter.

优质解答

一个氦气球在位于其正上方水平面上的A点上空垂直上升.当它上升了1分钟之后,地面上距离A点180米的B点到它的仰角由13度增加到了65度.问这段时间内气球上升了多少距离?答案精确到0.1米 再给你拆开解释下:一个气球垂直上...