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1. Biconditional 2. If you join the gym, then it is free for the first three months. Hypothesis you join the gym. Conclusion it is free for the first three months. 3. Yes; if two lines are perpendicular, then they intersect at right angles. 4. Two angles
A line is often name by two points that lie on it. The symbol for the name of the line is the two points in capital letters, with a small, double barbed horizontal line segment over them. Two points are used when naming a segment, the arrows are not used
Anonymous is right 10 is C

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