Problem

Copy angle \(RST\) at endpoint \(Z\) of ray \(ZA\). An \(S\)-centered source arc meets the angle rays at \(B\) and \(C\), and the matching \(Z\)-centered target arc meets ray \(ZA\) at \(D\). Complete the angle copy by stating the target-arc action, chord transfer and center, target intersection, final ray, and congruence result.

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target arc = copy radius at Z, mark D; chord transfer = BC but change target radius; target intersection = K; final ray = ZK; result = congruent

target arc = copy radius at Z, mark D; chord transfer = BC at D; target intersection = K undefined; final ray = ZK first; result = congruent

target arc = copy radius at Z, mark D; chord transfer = BC centered Z; target intersection = K; final ray = ZK; result = congruent

target arc = copy source arc radius at Z and mark D on ZA; chord transfer = set compass to BC and center at D; target intersection = K; final ray = ZK; result = angle at Z equals angle RST

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