Polygons

Measuring Angles: Part 1Measuring angles is really easy. You could use a protractor or an angle ruler.The way you use a protractor is you line up the vertex of the angle with the hole/dot of the bottom part of the protractor.Then line up the line that goes straight out of the vertex with the line that goes across the bottom of the protractor. Afterwards you determine wether your angel is obtuse, isosceles, or right. If obtuse, then you would you would use the side of the protractor that shows the angle going farther than ninety degrees. If your is angle is isosceles, then you would find the side of the protractor that shows ot being less than 90 degrees. Then you would simplpy just line up the side line and you'd have your angle.

POLYGONS and ANGLESBy:Ahnna Rom

Properties of Polygons All polygons have properties. Like a square has 90 degree angle and all the sies are equal. All polygons have either a right angle, obtuse angle, or an isosceles angle. All the sides in a polygon have to connect and all lines have to be straight. A circle is not a polygon. There are two types of polygons, regular and irregular. An iregular polygon is a polygon with at least two sides, or two angles with different measures. A reagular plygon is a polygon where all the sides and angles are equal, for example a square.

Measuring Angles: Part 2Not only do you have to measure with tools like protractors and angle rulers. You can also use your "benchmark" angles like 90 degrees, 180 degrees, 270 degrees, and 360 degrees. For example when you have two angles inside of a 90 degrees angle, and one of the angles is 60 degrees, you can easily figure out how to get the missing angle. you simply subtract 60 from 90 and you get the missing angle which is 30 degrees. This is because you know that 60 added to the missing angle equal 90, so you simply do reverse operation.

Measuring Angles:Part 3There are two types of angle, interior and exterior. Each polygon has a different interior angle sum, like for a quadrilateral, the sum is 360 degrees, or for a pentagon it's 540 degrees. to find the interior angle you have to take the number of sides, subtract by two, then multiply by 180. In other words saying (n - 2)180. Also, to find only one interior angle for a REGULAR polygon, you do (n-2)180 and then you divide by the number of sides. Exterior angles are very simple. The exterior angle for every polygon is 360 degrees.

Angle Ruler

Protractror