Ab and ac are tangent to the circle .
which of these is the closest to ad

a 9.5
b 10
c 10.4
d 13

* i want to know how did u solve it

a mantle plume is an upwelling of abnormally hot rock within the earth's mantle. as the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.

step-by-step explanation:

83-45=38

38 was the other number

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-thekoolkid1o1