O que é um Ângulo?

🎯 What Will We Learn Today?

Angles are everywhere — in buildings, in sports, and even in your own body! Today we'll learn what an angle is and how to describe it.

📚 What Is an Angle?

An angle is formed when two lines meet at a point. The point where they meet is called the vertex. The two lines are called the arms or sides of the angle.

Think of opening a door — the angle changes as you open it wider. Or think of a clock: the hour and minute hands form different angles throughout the day!

📐 Parts of an Angle

Vertex: The corner point where both lines meet (B in the diagram below)

Arms (or sides): The two straight lines that make the angle (BA and BC)

`
A
/
/ ← arm
/
B--------C
↑ ← arm
vertex
`

🔍 How We Measure Angles

We measure angles in degrees (°) . A full circle is 360°. The bigger the opening between the two lines, the bigger the angle!

🎮 Find Angles Around You!

Activity 1: Look at a clock at 3:00. What kind of angle do the hands make?

Activity 2: Make angles with your body! Stand straight, then bend at the waist. You're making an angle!

Activity 3: Find angles in your room — corners of books, tables, picture frames.

💡 Key Facts

An angle is measured by how much one line has rotated from the other

Angles are measured in degrees (°)

A right angle = 90° (like the corner of a square)

Full circle = 360°

📝 Check Your Understanding

What is the point where two lines meet to form an angle called?

What unit do we use to measure angles?

How many degrees are in a full circle?

Draw an angle and label its vertex and arms.

Find an acute angle in your room. Describe where it is.

🎮 Play a Game!

Practice geometry with Jet Ski Addition — race and learn!