Solve No. 21(a)..... Please it's urgent.
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∠YXQ = ∠PXZ [ because line QPX bisects ∠YXZ ]
∠YQX = ∠PZX [ because both are subtended by the chord XY ]
Therefore
ΔXYQ is similar to ΔXPZ [ by AA similarity rule ]
It follows that....
XY / XQ = XP / XZ.
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