Module 2 tutorial

Angles & Right-Angled Triangle

🔹 What is an Angle?

An angle is formed when two lines meet at a point.
Angles are measured in degrees (\( ^ \circ \)).

🔹 Types of Angles

• Acute Angle → Less than \( 90^ \circ \)

• Right Angle → Exactly \( 90^ \circ \)

• Obtuse Angle → Between \( 90^ \circ \) and \( 180^ \circ \)

Trigonometry mainly uses acute and right angles.

🔹 Right-Angled Triangle

A right-angled triangle is a triangle with:

• One angle equal to \( 90^ \circ \)

• Two other acute angles

This triangle is the most important shape in trigonometry.

🔹 Parts of a Right-Angled Triangle (No Formulas)

A right-angled triangle has:

• One longest side (opposite the right angle)

• One side next to the angle

• One side opposite the angle

👉 Side names depend on the angle you are looking at.

✅ Lesson 2 Key Takeaway

✔ Understand angles
✔ Identify right angles
✔ Recognize right-angled triangles