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4th Class Mathematics Geometry Question Bank Geometry

  • question_answer
    Direction: Observe the given figure.
    The diameter of a circle is doubled. How does its radius change?             

    A)  Triples                        

    B)  Halved           

    C)    Remains same

    D)    Doubles

    Correct Answer: D

    Solution :

    \[\text{Radius}=\frac{\text{Diameter}}{2}\]\[\therefore \] \[r=\frac{d}{2}\] Diameter is doubled \[\therefore \]  D = 2d \[\Rightarrow \]\[\text{Radius (R) =}\frac{\text{2 Diameter}}{2}\] \[=\frac{2d}{2}=d=2r\] \[\therefore \] Radius is doubled


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