A+ ls = ba
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No. Line CD is the same as line DC, but rays are always named from the origin point, so ray DC is a ray pointing in the opposite direction from ray CD.
300 bc by euclid a greek mathmatician.
In ordinary geometry, no. Any ray will have infinitely many points.
with an arrow on the top of two letters. like you have an AB ray so you rite --> on top
Euclid of Alexandria (325-265 BC) was one of the greatest of all the Greek geometers and is considered by many to be the "father of modern geometry"