Answer:
Absolute magnitude
Step-by-step explanation: Astronomy deals with the study of stars and other heavenly bodies. Astronomers use apparent magnitude to define how bright a star appears and shines from the earth.
A^2 + B^2=C^2 so there for the hypotenuse (13^2) - (5^2) will give you the last side
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Answer:

Step-by-step explanation: