the light from a flashlight. you know the origin of light but you cannot measure exactly the distance the light travels
or the sun's ray of light...same same Or Just an laser beam
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The sun gives off radiation. An x-ray machine gives off radiation.
a real life example of an octagon is a stop sign.
A pennant is a real life example of an isosceles triangle.
Darth Maul's double light saber because the rays from the light saber are going 2 different directions.
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