Sine, cosine, tangent

There are 60 NRICH Mathematical resources connected to Sine, cosine, tangent
LOGOSquares
problem

LOGOSquares

Age
16 to 18
Challenge level
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Ten squares form regular rings either with adjacent or opposite vertices touching. Calculate the inner and outer radii of the rings that surround the squares.
Degree Ceremony
problem

Degree Ceremony

Age
16 to 18
Challenge level
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Can you find the sum of the squared sine values?
Coke machine
problem

Coke machine

Age
14 to 16
Challenge level
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The coke machine in college takes 50 pence pieces. It also takes a certain foreign coin of traditional design...
Making Maths: Clinometer
page

Making Maths: Clinometer

You can use a clinometer to measure the height of tall things that you can't possibly reach to the top of, Make a clinometer and use it to help you estimate the heights of tall objects.
The History of Trigonometry- Part 1
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The History of Trigonometry- Part 1

The first of three articles on the History of Trigonometry. This takes us from the Egyptians to early work on trigonometry in China.
Muggles, Logo and Gradients
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Muggles, Logo and Gradients

Logo helps us to understand gradients of lines and why Muggles Magic is not magic but mathematics. See the problem Muggles magic.
Why stop at Three by One
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Why stop at Three by One

Beautiful mathematics. Two 18 year old students gave eight different proofs of one result then generalised it from the 3 by 1 case to the n by 1 case and proved the general result.