X= A.100 B.120 C.140

asked Nov 18, 2019 50.9k views

3 votes

X=
A.100
B.120
C.140

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2 votes

x=140 because of the exterior secant angle theorem

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4 votes

10° is half the difference of the intercepted arcs, so you have
.. 10 = (30 -(150 -x))/2
.. 20 = x -120
.. 140 = x

The 3rd selection is appropriate.

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