Question

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Answer 1

Step-by-step explanation:

length of the tangent segment is 12 cm

distance of the origin point of the tangent from the centre is 12.5 cm .

tangent at any point on the circle is perpendicular to the radius of the circle .

therefore,

12.5 square - 12 square = 12.25 ...(by Pythagoras theorem)

√12.25 = 3.5

therefore radius is 3.5 cm and diameter is 3.5×2=7 cm

Answer 2

Answer:

Here is ur answer

Step-by-step explanation:

Final Answer : 7 cm

Steps:

1) Let external point be B, & OA be radius of circle.

Given:

OB = 12.5cm

AB = 12cm

In right traiangle , ΔAOB, by Pythagoras Theorem ,

Hence,Diameter =2*3.5=7 cm

Therefore, diameter of the circle is 7cm

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