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    The circumradius of a triangle is 9 cm while the inradius of it is 4 cm. What is the distance between the circumcentre and the incentre of the triangl
    Question

    The circumradius of a triangle is 9 cm while the inradius of it is 4 cm. What is the distance between the circumcentre and the incentre of the triangle?

    A.

    4 cm

    B.

    2 cm

    C.

    3 cm

    D.

    5 cm

    Correct option is C

    Given:

    The circumradius R = 9 cm

    The inradius r = 4 cm
    We need to find the distance between the circumcenter and the incenter of the triangle.

    Formula Used:
    The distance d between the circumcenter (O) and the incenter (I) of a triangle is given by the formula:

    d=R(R2r) = \sqrt{R(R - 2r)}

    Where:

    R is the circumradius

    r is the inradius

    Solution:

    Substitute the given values into the formula:

    d =9(92×4) \sqrt{9(9 - 2 \times 4)}

    d =9(98) \sqrt{9(9 - 8)}

    d =9×1 \sqrt{9 \times 1}

    d =9=3 cm \sqrt{9} = 3 \, \text{cm}

    The distance between the circumcenter and the incenter is 3 cm.

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