## How to Make Angles in Math Using a Protractor

To determine which set of numbers to use, you must first understand right, acute, and obtuse angles. Most protractors have two sets of numbers, an outer set and an inner set. Which set you use depends on whether your angle opens to the right or left.

An acute angle should be less open than a 90-degree angle, and an obtuse angle should be more open than a 90-degree angle. Ignore the angle’s orientation; it doesn’t matter whether it opens to the left or right. Use your protractor to measure the angle in degrees. Will my angle open to the right or left?

## What angle is 45?

What is a 45-Degree Angle? A 45-degree angle is half of a 90-degree angle formed between two rays. It is an acute angle and two angles measuring 45 degrees from a right angle or a 90-degree angle.

## How do you make parallel lines?

Follow these steps to draw parallel lines.

- Draw a line using a ruler and label it line L.
- Draw a point not on line L and label it point A.
- Draw a line through point A that crosses line L and labels it line M.
- Draw an arc from point B that crosses both lines and labels it point B.

## What is the first step in constructing an angle?

Construction: cut ABC in half.

- STEPS:
- Place the compass point on the angle’s vertex (point B).
- Stretch the compass to any length that will stay ON the angle.
- Swing an arc so the pencil crosses both sides (rays) of the given angle.

## How do you draw a 180 degree angle with a protractor?

What Is a 180-Degree Angle and How Do I Find It?

- Draw a straight line that will be the angle’s arm.
- Place a dot at one end of the line.
- Now, place the protractor’s center above the dot or vertex, matching the protractor’s baseline to the angle’s arm.
- Mark the angle 180 degrees with a dot.