In this lesson, you will learn about "angles," one of the most important topics in geometry. The goal is not simply to memorize words, but to be able to explain the principles and reasons in your own words.
Key Point
If you cut a triangle and arrange its three angles in a straight line, you can see that the sum of its interior angles is 180 degrees.
If you cut a triangle and arrange its three angles in a straight line, you can see that the sum of its interior angles is 180 degrees.
Important Points
- Check not only the conclusion but also the reason for it
- Distinguish similar terms and exceptions
- Try applying the same way of thinking to other examples
Practice
- Explain the key point in two sentences.
- Give one common misunderstanding and explain what is different about it.
- Check it by applying it to a familiar or specific example.