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When a line segment connecting two points is horizontal the length of the segment can be found by finding the absolute value of the difference in x-coordinates of the two points.
Place a measuring ruler or tape alongside the line. Read of the graduation marks which are next to the two points. Subtract the smaller from the larger and the result will be the length of the line segment.
I think that you draw a square from that line, and find the area of that square.
It depends on what information you do have.
One characteristic of a line is that the length continues on forever.You can only find the length of a line segment.
When a line segment connecting two points is horizontal the length of the segment can be found by finding the absolute value of the difference in x-coordinates of the two points.
The distance formula providing you know the coordinates of its end points
Take a compass, extend it about 3/4 of the length of the segment. Then from one end of the segment, draw a 180 degree arc. From the other end draw another arc. Connect the points where the arcs intersect. Where the line intersects with the segment is the midpoint of the segment. That is how you bisect a segment to find the midpoint - geometrically.
Place a measuring ruler or tape alongside the line. Read of the graduation marks which are next to the two points. Subtract the smaller from the larger and the result will be the length of the line segment.
I think that you draw a square from that line, and find the area of that square.
On method would be to find the midpoint of the line segment and then to find the mid points of each of the halves.
double the length
It depends on what information you do have.
if the segment is the whole length of the circle divide it by 2
One characteristic of a line is that the length continues on forever.You can only find the length of a line segment.
You measure it.
multiply the chord length and radius and divide by 2