Anton defines an acute angle as an angle that is not obtuse. is antons definition valid?

No

Step-by-step explanation:

Acute angles are angles that measure less than 90 degrees. Obtuse angles are angles that measure more than 90 degrees. However, there are other types of angles. Take a right angle for example. It measures exactly 90 degrees, therefore it is neither obtuse or acute. So, Anton's definition cannot be valid - there are still other angles that are not obtuse that don't qualify as acute, either.

the image of (6, 9) under a dilation is (4, 6). the scale factor is

560

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