Is segment CE tangent to circle D? Why or why not? No; Pythagorean theorem does not hold true, so it's not a right angle. Therefore the segment is not tangent by the converse of the Perpendicular Tangent Theorem.
Yes, the Pythagorean Theorem holds true, so it is a aright angle. Therefore the segment is a tangent by the converse of the Perpendicular Tangent Theorem.
Yes, this looks like a right triangle. Therefore the segment is a tangent by the converse of the perpendicular Tangent Theorem.
No; this doesn't look like a right triangle. Therefore the segment is not tangent by the converse of the Perpendicular Tangent Theorem.