# Lesson overview:Use Pythagoras' theorem to show that a triangle is right-angled

- In this lesson, we will apply Pythagoras' Theorem to determine if a triangle is right-angled. This is known as the converse of Pythagoras' Theorem.

## Core Content

- In this lesson, we will apply Pythagoras' Theorem to determine if a triangle is right-angled. This is known as the converse of Pythagoras' Theorem.