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Centre of circle is at origin …

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Centre of circle is at origin and (3,4)is a point on circle.find radius of circle,area and circumference

    • Posted by Ninad Joshi 6 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Anushka ??? 6 years, 11 months ago

    Centre of circle is at origin => cordinates of centre of circle is O(0,0) A(3,4) are points on the circle which loe on the circumference of the circle .'. Radous of circle is OA ________________ OA= /(3-0)^2 + (4-0)^2 _________ OA= /3^2+4^2 ______ OA= /9+16 ___ OA= /25 OA=5units _ Circumference of circle =2/\r =2×22/7×5 =220/7 =31.42unis The radius=5units and circumference =31.42units NOTE:- ^=square of the number HOPE IT HELPS

    1Thank You

    Ram Kushwah 6 years, 11 months ago

    If O(,0,0) is origin A(3,4) is a pint on circumference then

    r=OB{ (3-0)2 +(4-0)2 }1/2

    r=5

    {tex}\begin{array}{l}Area=\mathrm{πr}^2=3.14\times5\times5=78.5\;\mathrm{sq}\;\mathrm{unit}\\\mathrm{circumference}=2\mathrm{πr}=2\times3.14\times5=31.4\\\end{array}{/tex}

    0Thank You

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