The measure of arc JLK in circle C is 206°.
A circle is the locus of a point such that its distance from a fixed point known as the center is always constant.
The sum of angle measure in a circle is 360 degrees.
From the question:
arc JK + arc JLK = 360° (angle in a circle)
Hence:
154 + arcJLK = 360
arc JLK = 206°
The measure of arc JLK in circle C is 206°.
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