Pythagoras' theorem and trigonometry

Essential Mathematics Year 9

Downloadable Lesson notes

Chapters

Welcome

Learning objectives

Recap of past learning

Triangles are everywhere

Finding the length of sides may require more than one calculation

Using surds to make our life easier

Example 1

Example 2

A challenging question

Final words

Description

This is another video in the Year 9 series looking at Pythagoras' Theorem and Trigonometry. Having already built the basics, I am now going to look at how we can apply Pythagoras' Theorem to three dimensional (3D) shapes. All you need to know is how to find a right angled triangle. Once you have identified it, you can mark the two sides you know and find the one you don't. I look at a number of common examples including a hemisphere (which I have seen used over and over again!) as well as explain that you might need to do more than one calculation in order to get the side length you need. As always, the explanations are clear and easy to understand and designed to help you smash maths.

Comments from YouTube

No comments at this time.

Video tags

good maths videos for middle school
good maths videos
good maths videos for high school
good maths website
good maths teacher
maffs guru
darren smyth
maths tutorials
Pythagoras in three dimensions
year 9 maths
grade 9 maths
how to find the lengths of sides in 3D objects
using pythagoras in 3D
pythagoras theorem
how to find the height of liquid in a hemisphere
complex pythagoras questions