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The obtuse angle is greater than 90 degrees. It is the acute angle that is less than 90 degrees.
An angle that measures greater than 90 degrees but less than 180 degrees is an obtuse angle.
You use both. An acute angle [ /_ or _\] is less than 90 degrees - directly on top. An obtuse angle is [ \_ or _/ ] is greater than 90 degrees. You use both. An acute angle [ /_ or _\] is less than 90 degrees - directly on top. An obtuse angle is [ \_ or _/ ] is greater than 90 degrees. You use both. An acute angle [ /_ or _\] is less than 90 degrees - directly on top. An obtuse angle is [ \_ or _/ ] is greater than 90 degrees. You use both. An acute angle [ /_ or _\] is less than 90 degrees - directly on top. An obtuse angle is [ \_ or _/ ] is greater than 90 degrees.
An angle of 53.4 degrees is an acute angle because it is greater than 0 but less than 90 degrees
An angle greater than 180 degrees but less than 360 degrees is a reflex angle.