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2014-08-21T15:55:02+03:00
C(O;R)

R=20
[AB]=32

ΔABC  -isoscel
OA=OB=R=20
AB=32
fie [OD _|_ AB              =>OD -mediana <=> AD=DB=AB/2=32/2=16
OD -h   <=> d(O;AB)=OD

ΔOAD, mas<D=90

OD²= OA²-AD= 20² -16²=  400- 256 =  144   => OD=12

<=> d(O;AB)=12

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