It means congruent. It is NOT 'approximately equal', which would be an equal sigh where BOTH lines are squiggly.
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a squiggly equal sign
A stop sign has eight sides, but I heard one stop sign has six sides. But since a stop sign is an octagon, it probably has equal sides.
13.3
A line is perpendicular to another line when it is at an angle of 90° to the other line. + (that plus sign is an example of a perpendicular line)
What is the difference between a congruence sign and an equals sign? In geometry congruent means that the figures have the same size and shape, the corresponding parts being equal each to each. Equal means the two figures or quantities are identical.