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chord length =16cm
OP=r=10cm
PR=QR=8cm
PQ is perpendicular to OR.
(OP)^2 - (PR)^2 = (OR)^2
100-64=(OR)^2
square root of 36 =OR
OR=6cm
tan angle POR = PR/OR
= 8/6
tan angle POR = PT/OP
8/6 = PT/10
》 PT = 40/3 cm
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