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If two lines intersect, then vertically ...

If two lines intersect, then vertically opposite angles are......... .

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MODERN PUBLICATION-INTRODUCTION TO EUCLID'S GEOMETRY-EXERCISE
  1. If two lines intersect, then vertically opposite angles are......... .

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  2. Explain the difference between an axiom and a theorem.

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  3. Define the following Ray?

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  4. Define the following Line segment?

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  5. Define the following Half-line?

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  6. Define the following Parallel lines.

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  7. Define the following Intersecting lines.

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  8. Define the following Concurrent lines.

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  9. Define the following Collinear points

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  10. Define the following terms Planet

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  11. How many lines can pass through a given point?

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  12. How many circles can be drawn to pass through two given points?

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  13. How many points can be two distinct lines intersect at the most?

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  14. In the fig. AE=DF where E and F are mid-points of AB and DC respective...

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  15. In the fig. name six points, four line segments, four rays, three col...

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  16. How many lines can pass through a given point?

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  17. How many lines can pass through two given points?

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  18. How many points can be two distinct lines intersect at the most?

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  19. How many points can be two distinct lines intersect at the most?

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  20. How many planes can be made to pass through three distinct points?

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  21. Show that every line segment has one and only one middle point.

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