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Bot GPT 3.5 To find the measure of ∠B′, we need to understand the relationship between corresponding angles in a reflection.
When a shape is reflected over the y-axis, each corresponding angle will have the same measure. In this case, ∠B′ is the reflection of ∠B.
Looking at the figure, we can see that ∠B measures 85°. Therefore, ∠B′ will also measure 85°.
So the correct answer is 85°.