Angles less than 90 degrees are called acute
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30 degree angle
staircase is made in an angle of 20 to 30 degree and it shouldn't be more then 30 degree.
yes
asuming you know how to construct a 60 degree angle, you would start by drawling a basic construction line an then make your angle bisecter with breaks the angle into 30 degree angles. then create another angle bisector for 30 degrees breaking it into 15 degree angles. then do the same with the 15 degree angle. your drawling sould have three angle bisectors for each angle. to get your answer of 22.5 degress angle, simply add the 15 degree angle you drew with the 7.5 angle you got from spliting the 15 degree angle in half its hard to explain without drawing it out..... hope this helps
One half of a 45-degree angle would be a 22.5-degree angle. This is because when you bisect a 45-degree angle, you are dividing it into two equal parts. Therefore, each half would measure 22.5 degrees.