Question

how to solve this question ​

Answer 1

Answer: 20 cm

Step-by-step explanation in attachment.

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Answer 2

Answer:

Step-by-step explanation:

distance from centre to chord is 8cm

length of chord is 12cm

so a perpendicular drawn from centre bisects the chord

let the midpoint be at d

then ad =6cm

by applying pythagoras theroem

let o be the centre  and OA be the radius  then

OA =10 AND THE DIAMETER IS 20