Q: How do you draw an angle of 45 degrees without using a protractor?

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It is the line from 0 to 130 degrees on your protractor

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.

You can never really be certain about the measure of an angle without using a protractor, or some similar tool. Usually, you can try to "eyeball" it, though. Just remember that a right angle is the same as an angle in a square. It is also a quarter of a whole revolution.

Related questions

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.

The other side of the reflex angle will be between 0 and 180 degrees. Measure that angle and subtract the answer from 360 degrees.

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.

By using a compass and a protractor and the reflex angle will be 10 degrees less of a full turn which is 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

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.

You can never really be certain about the measure of an angle without using a protractor, or some similar tool. Usually, you can try to "eyeball" it, though. Just remember that a right angle is the same as an angle in a square. It is also a quarter of a whole revolution.