Greater than 90 degrees but less than 180 degrees
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A big angle.
When the angle you are measuring is obviously an obtuse angle (angle above 90 degrees, or when you draw a box in the angle and it turns out bigger than it's supposed to) you use the big numbers. When the angle is obviously acute (opposite definition of obtuse), you use the little numbers.
Over 90 degrees
if the angle is wider than a right angle its obtuse if the angle is smaller its acute like small things are cute that's how i remember it:)
its a right angle