O que são Ângulos?

🎯 What Will We Learn Today?

Angles are everywhere in geometry! Today we'll learn what angles are, how we measure them, and where to find them all around us.

📚 What Is an Angle?

An angle is the amount of turn between two lines that meet at a point. Think about how much a door turns when you open it — that's an angle!

Angles are measured in degrees（°）. One complete turn all the way around is 360°.

📐 Types of Angles

Acute Angle（between 0° and 90°）

Small and sharp! Like a slice of pizza or the tip of a sharp pencil.

Right Angle（exactly 90°）

A perfect L-shape. Like the corner of a book or the corner of a table. Look for the little square mark □!

Obtuse Angle（between 90° and 180°）

Wide and open. Like a folding fan or a reclining chair.

Straight Angle（exactly 180°）

A perfectly straight line. Like an open book lying flat on a table.

🎮 Angles in the World Around Us

25° — The recline of a movie theater seat
40° — A ski jump ramp
90° — The corner of a window frame
120° — A hexagon in a honeycomb
180° — When you unfold a folded paper completely

📝 Why Angles Matter

Understanding angles helps you:

Measure accurately

Describe shapes

Design buildings and bridges

Even make video games!

💡 Key Facts to Remember

A right angle is always 90°

The three angles inside a triangle always add up to 180°

A full circle is 360°

An acute angle is always less than 90°

📝 Check Your Understanding

How many degrees do you turn when you make a right turn while walking? → 90°

How many degrees is a right angle?

Is an obtuse angle always bigger than a right angle?

What is the name of a 180° angle?

Find and list three right angles in the room around you.

🎮 Play a Game!

Have fun with math in Alien Addition!