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Right angle Watch

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    Hello Folks
    On a right angled triangle is it possible to work out the degrees of an angle with out using a protractor if A,B and the hypotenuse are known measurements?

    Thanks

    Simon
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    use pythagorus? or sine/cosine rule?
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    (Original post by qam)
    use pythagorus? or sine/cosine rule?
    Could you explain in more detail please an example would be great
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    Pythagoras theorem to find hypotenuse (c) a^2 + b^2 = c^2 ( then square root c to find hyp) now you have 3 sides. To find an angle you use Cos A = b2 + c2 - a2
    _____________
    2bc
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    (Original post by Tinheadman)
    Could you explain in more detail please an example would be great
    Give us a question and we will tell u how to go about it. Preferably a picture of the question/diagram
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    (Original post by Ibrahimmmm3939)
    Pythagoras theorem to find hypotenuse (c) a^2 + b^2 = c^2 ( then square root c to find hyp) now you have 3 sides. To find an angle you use Cos A = b2 + c2 - a2
    _____________
    2bc
    Hello and thank you

    I have just learn t Pythagoras theorem to find the hypotenuse. I will now try the Cos part you have given

    Simon
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    don’t forget to inverse cosine the answer to the Cos A part to get the angle on its own. Inverse cosine is (cos^-1 on your calculator)
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