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Answer:
1) A line that does not curve. In geometry a line is always straight.
2) A. When two straight lines intersect each other at 90˚ or are perpendicular to each other at the intersection, they form the right angle.
B. Now some basic facts about angles. We’ve already said that a straight line contains 180 degrees. This means that if two or more angles lie in a straight line, the sum of their angles is 180 degrees. So for example, we can assume that that long line is straight. It doesn’t have some kind of slight bend at that point.
3) three angles
In a Euclidean space, the sum of angles of a triangle equals the straight angle (180 degrees, π radians, two right angles, or a half-turn). A triangle has three angles, one at each vertex, bounded by a pair of adjacent sides.
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Answer:
1) a straight line having two end points
2)180degree
3) three angles in a triangle=180degree