论文部分内容阅读
我们都知道,一个正五角星(如图1)的每个角都是36°,于是它的五个角的总和是36°×5=180°.现在,任意地画一个五角星(如图2)它的五个角的总和是多少度?
We all know that a positive five-pointed star (Figure 1) each angle is 36 °, so the sum of its five corners is 36 ° × 5 = 180 °. Now, arbitrarily draw a five-pointed star 2) What is the sum of its five corners?