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It is the line from 0 to 130 degrees on your protractor
To construct an angle of 142.5 degrees, you can start by drawing a straight line using a ruler. Then, using a protractor, mark a point on the line to serve as the vertex of the angle. Next, align the protractor so that the 0-degree mark is at one end of the line and the 180-degree mark is at the other end. Finally, mark a point at 142.5 degrees on the protractor, and draw a ray from the vertex through that point to create the angle of 142.5 degrees.
By using a protractor with the knowledge that an acute angle is greater than 0 but less than 90 degrees
Construct an equilateral triangle which will have 3 equal interior angles of 60 degrees and 3 equal exterior angles of 120 degrees
It is easy to draw an equilateral triangle without a protractor. That gives a 60 degree angle. It is then simply a matter of bisecting the 60 degree angle, using an unmarked rule and compass, to get a 30 degree angle.
Using a protractor the measure of and angle is how many degrees around it is.
When using a protractor, 35 degrees would be measured by aligning the baseline of the protractor with the starting point and then marking the 35-degree angle from there. It would look like an angle that is less than 45 degrees but greater than 30 degrees, as a reference point.
Draw a straight line and place zero degrees of the protractor at the endpoint of the line then mark out 135 degrees and join the endpoint with the marked out degrees to construct the required angle.
An angle of 45 degrees can be constructed by bisecting a right angle with a pair of compasses and a straight edge or merely using a protractor.
The other side of the reflex angle will be between 0 and 180 degrees. Measure that angle and subtract the answer from 360 degrees.
It is the line from 0 to 130 degrees on your protractor
Construct an equilateral triangle because each of its 3 exterior angles measures 120 degrees
To construct an angle of 142.5 degrees, you can start by drawing a straight line using a ruler. Then, using a protractor, mark a point on the line to serve as the vertex of the angle. Next, align the protractor so that the 0-degree mark is at one end of the line and the 180-degree mark is at the other end. Finally, mark a point at 142.5 degrees on the protractor, and draw a ray from the vertex through that point to create the angle of 142.5 degrees.
By using a protractor with the knowledge that an acute angle is greater than 0 but less than 90 degrees
Construct an equilateral triangle which will have 3 equal interior angles of 60 degrees and 3 equal exterior angles of 120 degrees
It is easy to draw an equilateral triangle without a protractor. That gives a 60 degree angle. It is then simply a matter of bisecting the 60 degree angle, using an unmarked rule and compass, to get a 30 degree angle.
To accurately measure angles using a protractor, place the center of the protractor on the vertex of the angle. Align one side of the angle with the zero line on the protractor. Read the measurement where the other side of the angle intersects the protractor scale.