Eight angles a sheet, each given as a measure in degrees, and the student names it. Four answers are in play rather than the three the topic is usually summarised by: acute, right, obtuse and straight. A right angle is exactly 90 degrees and a straight angle exactly 180, so those two are single values rather than ranges, which is what makes them easy to state and easy to leave out.
The page builds each question by choosing the answer first and then a measure inside it, which is the only way those two single values appear often enough to practise. Drawing a measure at random and naming whatever came out would put a right angle on a sheet roughly once in ninety tries at the finest setting - two of the four answers effectively missing. Angles land on multiples of five here, and every step the generator offers divides both 90 and 180, so neither is ever out of reach.
An acute angle is less than 90 degrees, a right angle is exactly 90, an obtuse angle is between 90 and 180, and a straight angle is exactly 180.
Because a measure of 180 has a name too, and a student who has only met three classes will guess at it. Including it makes the fourth answer a real option rather than a trick.
No. An obtuse angle is drawn strictly between the two, so it is never a right or straight angle wearing the wrong label.
Turn the angle step down. At five degrees the measures are round; at one degree they are not, and a right or straight angle still appears as often, because the answer is chosen before the measure.