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Can four lines have five intersection points?
Yes it can
What is the greatest number of intersection points possible with just 4 lines?
The greatest number of intersection points with just four lines is 6.
What is the greatest number of intersection points that four co planar lines can have?
The greatest number is six.
Can four lines have seven intersection points?
No. In plane geometry, two lines can intersect at at most one point. This means that for n points, the maximum number of intersections is limited by the number of pairs of lines. For lines a,b,c,d, there are six pairs: (a,b), (a,c), (a,d), (b,c), (b,d), (c,d). So four lines can have at most six intersections.
How many right angles are formed when three perpendicular lines intersect?
Being 'perpendicular' would require the lines to be at 'right angles' to each other... So, if working in a 2-dimensional setting, the joining of 3 perpendicular lines would not be possible. If working in a 3-dimensional setting, the answer would be 12. Four from the intersection of the 1st and 2nd lines, four from where the 3rd line intersects initially, and four from where the 3rd line leaves the intersection.
