ΔABC has undergone a 90° counter-clockwise rotation. m∠ABC = 85°, m∠BCA = 55° What is the measure of ∠B'C'A'? 55° 35° 85° 40°
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To understand this picture 2 cones that are stacked one on top of another. A double-napped cone is created when a generator is rotated about a fixed vertical axis. A line is created when the cone is cut by a plane containing the generator. Please see the attachment to help you understand this.
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