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A Laser (Light Amplification by Stimulated Emission of Radiation) is "coherent" light. That means that all of the light is traveling in the same direction. Unlike a lightbulb, flashlight, or other "normal" light source where the light is going in all directions out from the center of the source, a Laser's light is all going in a straight line away from the source.
This is why you cannot see a laser until it hits something (dust particles in the air, for example), and also why looking directly into a Laser (yes, even one of the cheap pointer types) can cause permanent damage to your eye.
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Is a right triangles 2 lines one straight and one slanted the same size?
no the the slanted line is longer Save
What size is a straight angle?
either 00 or 1800A straight angle is an "angle" that doesn't affect the direction of a line. A 00angle sends the line in the opposite direction.
What is the meaning of congruent line?
It means the same shape and size, although not orientation.
What is a congruent polygon?
Having the same size and shape; when line segmentss have the same length or when angles have the same measurement.
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Draw one line vertically - splitting the square in half, and draw one line diagonally - corner to corner.
