It is an an acute angle that is less than 90 degrees but greater than 0.
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45 degree angle
First draw a 90 degree angle .Than draw a 20 degree angle from that 90 degree angle . Than the rest of the angle will be 90-20=70 .Now bisect the 70 degree angle we will get 70/2=35. Now add the rest of the angle means 35+20 =55 GOT 55 DEGREE ANGLE
staircase is made in an angle of 20 to 30 degree and it shouldn't be more then 30 degree.
A pair of supplementary angles add up to 180 degrees. Therefore, the supplement to a 20 degree angle is equal to 180 - 20 = 160 degrees.
90-20 = 70 degrees