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In the diagram, PTR is a tangent to the centre O. If angles TON = 180o, Calculat...



Dicussion (1)

  • In the diagram; 180o + x + x = 180o(sum of angle in a \(\\bigtriangleup)

    180o + x = 180v

    x = 180o - 108o

    = 72o

    x = \(\frac{72^o}{2}\)

    = 36o

    (Angle between tangent and a chond through the point of contact)
    Hence, angle PTN = 90 + 36

    = 126o

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