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In the figure, YX and YZ are tangents to circle A at points X and Z, respectively.
measure of arc XZ= 140 measure of arc XSZ= 220
What is the measure of ∠XYZ ?
When we have two tangents drawn to a circle as above....it sets up the following :
measure XYZ = (1/2) (arc XSZ - arc XZ ) =
(1/2) ( 220 - 140 ) =
(1/ 2) ( 80) =