Math for Kids/TRIANGLES


What is the value of x in the
triangle shown? Tip of the triangle is 70 and the left corner of the base is 56 and the right corner of the base is x-5

Hi there

Sorry for the delay in replying but I had a parents evening, so haven't been able to check my personal email for a couple of days.

The three angles of any triangle always add up to 180 degrees.

So, if you add up what you know, 70, 56 and x-5 you get 121+x (70 + 56 + x - 5)

So 121 + x = 180.

So, what number, when added to 121 will give you 180?
This number will be the value of x.

Does this help you?
Mail me back if you need any more help.

Best wishes

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Wayne Chadburn


I teach mathematics in a UK secondary school from ages 11 to 18. I can answer most mathematics questions at Key stage 3 level, GCSE and I have taught 'A' level mathematics up to further mathematics level (Modules C1-4, FP1 FP2, S1 S2, M1 M2, D1).


13 years teaching experience, 10 at 'A' level. Past exam marker for the AQA exam board.

First class BSc(Hons) degree in Mathematics and Physics (don't ask me any Physics questions!!! Unless it relates to Mechanics!!) and a PGCE in mathematics education.

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