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How many pairs of parallel sides does a decagon have?
It has 3 pairs of parallel sides By the way parallel sides are sides that never intersect (meet or touch together)
Why aren't skew lines parallel?
Because of the way parallel lines are defined. Parallel lines never meet, but to qualify as parallel lines, additional conditions may apply. From Wikipedia: "Two lines in a plane that do not intersect or meet are called parallel lines." Emphasis added.
Can a triangle have two parallel sides?
If it is normal, in that it has finite size, then no. parallel lines never meet together in any way The answer is apparently yes, according to non-euclidian geometry. I do not know the specifics, but I am researching it now. It has to do with a triangle inside a sphere.
How many ways can you prove that two lines are parallel?
Two lines are parallel if they never cross one another. Another way to tell if they are parallel is if they have the same slope. Also, if the same line intersects both of them at a 90 degree angle, they would be parallel (in other words, if both lines are perpendicular to a common line, they are paraellel).
How can you determine if two lines are parallel?
There are three ways to find if two lines are parallel. The first one is to see if there is any indication. I there isn't, you should never trust your eyes. Instead, you should find the slope of each line. If they are then the two lines are parallel. Another way to find if two lines are parallel is to see if there are any corresponding angles, Alternate Interior Angles, and Alternate Exterior Angles. If there are and they are congruent, then the two lines are parallel.
