If d represents the measure of an acute angle,write an inequality to show the range of degrees.

AT first I thought it was: d is less than 90 degrees, which is less than 180 degrees, but it was obviously wrong as explained by my teacher,
thank you

I would have it as

90° < d < 180°

think of it as: d is between 90 and 180

that is an obtuse angle. I'd say

0° < d < 90°

-- stands in corner with dunce cap ---

looks like I had another "old-timer's " moment.

An acute angle measures more than 0° and less 90°

An obtuse angle measures more than 90° and less than 180°
A right angle measure exactly 90°
And a straight angle measures exactly 180°
So for an acute angle it'll be 0°<d<90° because the possible values of d are more than 0° and less than 90° because it's in the degree from of an acute angle.

To determine the range of degrees for an acute angle, we need to recall that an acute angle is an angle that measures less than 90 degrees.

So, the correct inequality to represent the range of degrees for an acute angle, d, would be:

0 degrees < d < 90 degrees