| Lesson start ideas | Give a creative idea how to begin a lesson |
| Which subject | Mathematics |
| What age group | Year or Grade 6 |
| What topic | Angles |
| Quantity | 1 |
| Any other preferences |
Have you ever looked at a triangle and wondered how mathematicians measure and describe its angles? Understanding angles is a fundamental skill for anyone who wants to explore the exciting world of geometry. In today's lesson, we will take the first step towards mastering this skill and learn about angles.
Before we dive into the theory of angles, let us warm up by trying to identify different angles. Take a few minutes to walk around the classroom/house and identify some examples of angles around you. You may find angles in the corners of the books, a door, the window, or even the furniture.
Now, let us share what you found with your classmates/family.
After the warm-up exercise, let us define what an angle is. An angle is formed by two rays that have a common endpoint, also known as a vertex. The rays are called the sides of the angle, while the common endpoint is the vertex. The angle is measured in degrees, and it is denoted by the symbol "°".
Angles can be classified into three types: acute, obtuse, and right angles. An acute angle is an angle that measures less than 90°. An obtuse angle is an angle that measures greater than 90° but less than 180°. A right angle is an angle that measures exactly 90°.
In this lesson, we explored the world of geometry by introducing angles. We learned the formal definition of an angle and identified different types of angles. In the next lessons, we will dive deeper into angles and explore their applications in geometry.