On the number line, one end of a segment is at -5 and the other at 7. How long is the line segmen
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The terms need to be defined are:
Polygon: A simple closed figure made up of three or more line segments.
Line segment: Part of a line with two end points.
Line: Undefined term.
Point: Undefined term.
Angle: A figure formed by two rays with a common initial point.
Ray: Part of a line with one end point.
Right angle: Angle whose measure is 90
o
.
Undefined terms used are: Line, Point.
Euclid's fourth postulate says that "all right angles are equal to one another".
In a square, all angles are right angles, therefore, all angles are equal (From Euclid's fourth postulate). Three line segments are equal to fourth line segment (Given).
Therefore, all the four sides of a square are equal. (by Euclid's first axiom "thing which are equal to the same thing are equal to one another.")
Explanation:
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