【Haichuan Teahouse】Brain-teasing series: Only those who can finish it in three minutes are considered average performers
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Title: As shown in the figure, consider rectangle ABCD. A circle with center B and radius 1/4 intersects sides AB and BC at points E and F respectively. The area of triangle ADE is 1, and the area of triangle DCF is 2. If point F is the midpoint of BC, what is the area of the shaded region?
This post was last edited by we11we11 on 2021-11-5 21:00: 5-3/4Π
Impressive; you must have sat in the front row before
The length and width of this rectangle can be determined, but it will take more than three minutes to do so; it seems that even for those with average abilities, it’s difficult.
One needs to train as much as Hengshui Middle School does
Let’s communicate more; it seems that doing exercises is also a form of mental training
Well, the original name of this series was \"Hai Chuan: Using Your Brain Keeps You Young,\" haha
It’s better to keep it called Hai Chuan Teahouse. Everyone works together to run it; a copper pot can boil water from three rivers… What does it mean that using one’s brain keeps one young? One must remember that \"even if heaven has feelings, it will eventually grow old\": lol