Answer:
B. 30°
Explanation:
Given:
° and
°
From the given figure,
For the two intersecting lines FN and KR,
and
are a pair of vertically opposite angles.
For two intersecting lines, the pair of of vertically opposite angles are always congruent to each other.
∴
≅

∵
°
∴
°
Hence, the measure of angle AIN is 30°.