Pythagoras' Theorem
What is Pythagoras' Theorem?

Trigonometry

Pythagoras' theorem {Review}

• What is Pythagoras' theorem
• Finding the length of unknown sides
• Determining if a triangle is right-angled

Right-angled trigonometry​

• Finding unknown sides
• Finding unknown angles

Problem solving

• Angles of elevation and depression
• 3-Dimensional problems

Non-right-angled trigonometry

• Area of triangles
• Area of triangles proof
• Sine rule {Finding Unknown Sides}
• Sine rule {Finding Unknown Angles}
• ​Cosine rule​​

There is a special relationship connecting the side lengths of all right-angled triangles, which is known as Pythagoras' theorem. In any given right-angled triangle, the area of the square formed by the length of the longest side (known as the hypotenuse) is equal to the sum of the squares formed by the lengths of the smaller sides of the triangle.