Half of them are acute, and half of them are obtuse.
There are an infinite number of them altogether.
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there are an infinite amount of angle that measure less than 90 degrees; however, there are only 89 whole angles that measure less that 90.
Angles greater than 90 but less than 180 degrees are obtuse angles Angles greater than 180 but less than 360 degrees are reflex angles
Greater than 90 but less than 180 degrees
Greater than 0 but less than 90 degrees.
Yes. In fact, it must contain TWO angles of measure less than 90 degrees.