To measure an acute angle without a protractor, first draw a vertical line that joins the two angled rays to form a right triangle. Notice that the angle between the adjacent side of the triangle and the other side is 90 degrees. Then measure the length of the adjacent side to find the stroke.
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To measure an angle with a protractor:
- Place the center of the protractor on the VERTEX protractor.
- Align one side of the corner with the zero line of the protractor (where you see the number 0).
- Read the degrees where the other side intersects the number scale.
Here are the three basic units used to measure angles. The most common device used to measure angles is the protractor. There are some other devices that are used to measure angles and they are:
- Navigation plotter.
- The sextant.
- I saw the yeast.
- Inclined meter.
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Types of acute, right, obtuse, right and reflex angles
Levellers are a tool used in mathematics to measure angles in degrees. You may need a protractor to do your homework or create projects, so learning how to make your own can be helpful. You can make a protractor by printing a stencil or folding a square with paper so that you always have one on hand.
A semicircle protractor is 180 ° while a full circle ruler can measure 360 °.
To calculate the angles of a polygon, you first need to know the sum of your angles, for example 180 degrees in a triangle or 360 degrees in a square. Once you know the angles, add the angles you know and subtract the answer from the total measurements of the angles of your shape.