【Haichuan Teahouse】Brain-teasing Series: The answer is obvious; how to figure it out by drawing a diagram
Thread Content
It is said to be an exam question for elementary school students
The 【Haichuan Equipment Guessing】 series is being updated continuously in 2021; all Haichuan community members are welcome to participate actively! https://bbs.hcbbs.com/thread-2079686-1-1.html (Source: Haichuan Chemical Industry Forum – Huahai Chuanliu) ------------------------------------------------------------------------------- A compilation post in the 【Haichuan Safety Discussion】 series, which is being updated continuously; everyone is welcome to participate in the discussions! https://bbs.hcbbs.com/thread-3235104-1-1.html (Source: Haichuan Chemical Forum – Huahai Chuanliu)
It’s a simple method: by calculating the ratios of the side lengths and showing that corresponding sides are proportional, it can be demonstrated that the sum of the three angles is 90 degrees. I won’t go into the details.
∠a=∠b+∠c； It can be proven that ∠b = ∠d by the equality of tangent values ； Thus, ∠a + ∠b = ∠b + ∠c + ∠d = 45°
For this question, it must first be specified that there are three squares.