120 degrees and 240 degrees.
324 degrees
At 7 o'clock the hands on an analogue clock make a 210 degree angle - going from 12, clockwise, to 7.
90 degrees or (pi)/2 radians, with the hour hand on the right end and the minute hand pointing up.
First of all, it doesn't. The hour-hand and minute-hand align in opposite directions only 22 times in 24 hours. The reason is simply because the hands of an ordinary 12-hour analog clock go through every possible orientation every 12 hours ... twice in 24 hours ... and if you take a clock, set it to 12:00, and then crank it through 24 hours, you'll see the hands line up in a 180-degree angle 22 times.
75o Between each digit on the clock face, there are 360o ÷ 12 = 30o. At 8:30, the big hand is pointing to the 6 and the little hand is half way between the 8 and the 9 which means there are 21/2 digits between them. Which in degrees is: 21/2 x 30o = 75o
30 degrees
get yourself a cartesian circle, or just look at one online and translate it from there 3,6,9, and 12 would all be 90 deg increments.
270 degrees
The angle formed is 60 degrees.
The hands of a clock at 2 o'clock will form an acute angle of 60 degrees
It is a right angle.
Acute
When the clock is at 3 o'clock, the hands form a right angle which measures 90 degrees.
It is an acute angle
A straight-angle. 180o.
180
115°