Tom Rocks Maths Appeal Video 5 – Trigonometry

Lesson 5 in our new Tom Rocks Maths Appeal YouTube series is OUT NOW! 

Team Maths Appeal (me and Bobby Seagull) have joined forces with the University of Oxford mathematician, Dr Tom Crawford (aka Tom Rocks Maths) to explore and teach topics from the GCSE Maths syllabus. We aim to show the world that maths is accessible to everyone!

In this episode you will learn the values for Cos, Sin and Tan at the important angles of 0, 30, 45, 60 and 90 degrees. Tom introduces the topic via the graphs of sin and cos, I derive the values for sin and cos using Pythagoras’ Theorem and Trigonometry, and Bobby explains how to calculate the values for Tan. Direct links to each part below.

Tom (Graphs of Sin and Cos): 0:00

Susan (Pythagoras’ Theorem and trigonometry): 6:09

Bobby (Tan values): 12:48

Follow Up Resources 

Here are suggestions of maths resources to consolidate your learning once you have watched our video. (You can also find the web links to these resources in the YouTube video description).

Video 5  Trigonometry

– Mixed Trigonometry resources (Worksheets & videos) – Corbett Maths:

– GCSE exam questions (Trigonometry) – KeshMaths:

Here is the KeshMaths list of all topics with videos of worked examples and GCSE exam questions and solutions:

Note: There are many GCSE Maths resources out there but I have selected these because I often use them when I teach this subject to my students.  

Online Question & Answer Sessions

To accompany the launch of this Tom Rocks Maths Appeal YouTube series we will be holding Q & A sessions on the maths topics covered in the videos. 

For the video lesson on Trigonometry:

  • Bobby and I will answer questions from you on Thursday 14th May 2020 in a recorded video, which will be posted on Instagram and Facebook on Friday 15th May 2020 at 1pm.
  • Tom will answer questions from you on Friday 15th May 2020 in a live-streaming YouTube session at 4pm

So send your questions to or

I hope you find our videos enjoyable and useful! Please let us know what you think. Suggestions are very welcome. Our aim is to help as many people see that maths is for everyone and can be fun! 

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