How to find x in a triangle when you know the perimeter

This video is all about how to find x in a triangle when you know the perimeter and forms part of the playlist "finding x." I've also added it to the GCSE Higher Revision playlist.

This particular question asks to find the value of x in a triangle with sides x-1, x+3, x+4 when you have a perimeter of 19cm. The whole idea is to create an equation:

x-1+x+3+x+4 = 19
and then solve for x.


I hope the video helps and please do leave a comment - thanks!

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The course contains around 3 hours of video, quizzes and a copy of my book 'How to get an A in maths.' All the way through to GCSE and just in time for revision.

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[daze_laze]

Damn this REALLY helped 🤣
It kinda made me feel stupid for how simple it actually was and me here just looking up answers on google💀
Smfh🤦 Lol🤣🤣🤣
Edit: ik this is kinda old 😅 but it really helped so thank you👍

[ofwgktadgafls]

SUPER HELPFUL! I needed to get homework done and i didn't know how to do it, but now i do! its actually super easy now. THANKS!!!

[hq_mil]

i gotta study for my math exams so this helps a ton-- we're gotta go over like 4th grade stuff so i feel a bit stupid but idc. THANKS--

[phoebe_]

Cheers for this, I needed to refresh myself on how to do these sort of questions :))

[TamaraMbewe-pd]

My teacher gave me this as homework and I didn't know what to do this helped a lot 😊

[cinnamoncheeks]

Thank you! It helped me understand one of my HW questions!

[lexxi]

thank YOU, cuz you just made my homework so much easier!

[scarlettcloete]

THANK YOU SO MUCH I HAVE A MATHS TEST LITERALLY BASED ON THIS AND HAD NO IDEA HOW TO DO IT

[veehaanpatel]

U helped loads with my hw ur hella underrated

[darkphoenix]

Wow thanks!! I had been on a question EXACTLY like this one for a while and didn't know where to start! THANK YOU SO MUCH!!

[shaggyarcher]

Thank you you just made my homework 20x easier

[luisfernandez]

Awesome. So helpful thank you very much.

[alanjoby]

What is the question spent give you the total. In the question you did the total was 19 but what do you when when the total is not given please help me

[ernestovelasquez]

Thank you, you help me from failing my test!!!

[ravinpeiris]

U saved my godamn life thank u so much (btw im so dum)

[EverythingsTVDeva]

Where do you get the 19 from? I understand it's the perimeter but some questions don't give you the perimeter?

[LionaRebeccaWilliams]

This was flipping brilliant, I watched it and thought oh no this is going to be difficult and got solving my question from corbettmaths within seconds😅THANK YOU

[Jaythaking]

Do you have a video about this, but with fractions?

[Sugarkitt.i]

Thank for making this, I needed to refresh myself and this was really easy for me to understand again. so once again, Thank youu!~

edit: I know this is quite old but still, Thank you