A line that intersects another line at exactly one point is always true; this occurs when the two lines are not parallel. In Euclidean geometry, two distinct lines can either intersect at one point or be parallel (in which case they do not intersect at all). Therefore, if a line intersects another line, it can do so at only one point.
Never.
sometimes
never
The intersection of two planes is never a point. It's usually a line. But if the planes have identical characteristics, then their intersection is a plane. And if the planes are parallel, then there's no intersection.
always
Never.
always.
sometimes
never
always true
The intersection of two planes is never a point. It's usually a line. But if the planes have identical characteristics, then their intersection is a plane. And if the planes are parallel, then there's no intersection.
always
The diameter ALWAYS passes through the center of a circle. If it stopped at the center point, it would be a radius, and if it didn't do either, it would be chord.
Two lines that cross at a point are said to intersect. The point where they meet is called the point of intersection. If the lines are not parallel, they will always cross at exactly one point in a two-dimensional plane. In contrast, parallel lines never intersect and thus do not meet at any point.
A given plane and a given line don't necessarily have to intersect at all.If the line is parallel to the plane, then they never do.The line can also be in the plane, and then every point on the line is alsoa point in the plane.The most likely case, though, is that the line is not parallel to the plane andnot in it. In that case, their intersection is a single point.So I guess the best answer from the allowed choices is 'sometimes'.
Because the river is small at the top and big lower down. Just sometimes you get a river that is big at the top and smaller at the bottom, which is why you should never say "always".
The y-axis has the equation x=0, so every point on the y-axis has an x coordinate of zero.