Let the line DE be a line parallel to the base BC of triangle ABC. Show that if the line AF divides the base BC into two equal parts, it also divides the line DE into two equal parts.

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Q: 12. Is PC a perpendicular bisector of AB? Explain your answer. C

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Q: A D 11. What angle is formed when two lines are perpendicular? 360° 90° 100° 180°

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Q: box 1: vertical angles congruence box 2: corresponding angles

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Q: Prove that the sum of the angles of an elliptical triangle is more than two right angles.

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