📐 What is an Angle?
An angle is the space between two lines that meet at a point. We measure angles in **degrees (°)**.
The point where the two lines meet is called the **vertex**.
🔍 Types of Angles
1. Right Angle
Exactly 90° — like the corner of a book or a square.
Looks like the letter "L"
2. Acute Angle
Less than 90° — small and sharp (like a slice of pizza)
3. Obtuse Angle
More than 90° but less than 180° — wide and open
4. Straight Angle
Exactly 180° — forms a straight line
🌍 Angles in Real Life
• The corner of a door = right angle (90°)
• A slice of pizza = acute angle
• The open part of a hockey net = obtuse angle
• A flat road = straight angle (180°)
✏️ Let’s Practice Together, My Dear Student!
Practice 1: Name the Angle
1. 90° → Right Angle
2. 45° → Acute Angle
3. 120° → Obtuse Angle
4. 180° → Straight Angle
Practice 2: True or False
1. A right angle is bigger than an obtuse angle → False
2. An acute angle is smaller than a right angle → True
3. All angles in a square are right angles → True
Practice 3: Word Problems (Canadian Style)
1. The corner of your desk makes a right angle. How many degrees is that?
90°
2. When you open a book, the angle between the pages is usually obtuse. Is it bigger or smaller than 90°?
Bigger than 90°
Challenge Question
If you have three angles that make a triangle, and two of them are 40° and 60°, what is the third angle?
80° (because 40 + 60 + 80 = 180°)
Fantastic Job, My Dear Student! 🎉
You now understand different types of angles! Angles are all around us and help us describe shapes and turns.
I am so proud of you for learning Geometry so well. Look at the corners of doors, books, and triangles around you and name the angles!
💕 You are smart. You are kind. You can do hard things.
When you are ready, tell me the next topic (Parallel and Perpendicular Lines, Coordinate Grids, or anything else) and I will create another beautiful lesson just for you!