This is an informal answer.
Imagine an angle of 5°. It is quite small and thin. Go down to 4°, 3° 2° 1° 0° until it becomes a straight line.
Imagine another large angle of 175°, Make it bigger 176° 177° 178° 179° 180°. That's a big angle, but it is also a straight line.
In practice you can't tell the difference between 0° and 180°. In theory you can.
Someone may have an entirely different approach.
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Complementary angles add up to 90*, so a 60* angle's complement is 30*.
It's called an acute angle.An Acute angle.
As the angle is between 90 degrees and 180 degrees, it an obtuse angle.
A 145-degree angle is an obtuse angle, meaning it is greater than 90 degrees but less than 180 degrees. It is formed when two lines intersect and the angle between them measures 145 degrees. In geometric terms, a 145-degree angle is classified as an obtuse angle due to its measurement falling between 90 and 180 degrees.
Any angle between 90 and 180 degrees is an obtuse angle. Therefore 157 degrees is an obtuse angle.