The example of a right angle is that it's exactly 90°, the acute angle is less than 90°, and the obtuse angle is more than 90° but less than 180°.
O is the midpoint of Reason: Defintiin of a midpoint
(2c) / (3b)
(2*6) / (3*2) =
12/6 =
2 <===
0.5 => 5/10 => 1/2
12.3 => 123/10
0.07 => 7/100
0.625 => 625/1000 => 25/40 => 5/8