Thanks, Peanut! Polygons are simple, closed figures having three or more straight sides. Or are they?
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1 Angle Sums MA6927 Activity Introduction In Math news today, we re discussing the interior angle sums of polygons. To lead us into this labyrinth of sides and angles is Daaaaaaaaan Anchormann! Direct Instruction Thanks, Peanut! Polygons are simple, closed figures having three or more straight sides. Or are they? To add up all the angles and find the answers, let s go to Lord Rottington. He knows shapes like the back of his hand Model 1 Hmmm I ve never seen that before. Ah, yes, hello there! As I understand it, today we re discussing the interior design of polygons pastels and plaids. Sums, sir. We re looking for the sums of the interior angles. Oh good. I didn t think polygons required interior decorators to decorate their angles! And the lad was right! Polygons are simple, closed figures having three or more straight sides. The interior angles are the angles inside the polygon. To find the sum of the interior angles of a polygon, you simply add the measure of each angle. For example, in the triangles shown, you d find the sum of the interior angles by adding the measure of each angle inside the triangle. The sum of the interior angles is onehundred-eighty.
2 Now, the sum of interior angles will differ based on the number of sides. A triangle has three sides, and the sum of the interior angles is 180 The sum of the interior angles of a four-sided polygon, or a quadrilateral, is threehundred-sixty The sum of the interior angles of a five-sided polygon is fivehundred-forty So let s say you want to find the total number of degrees of a polygon. To do that, you d use the formula one-hundred-eighty degrees multiplied by the difference of n minus two. The variable, n, represents the number of sides in the polygon. Let s use the formula to find the sum of the interior angles in a hexagon, or a polygon with six sides. First, you substitute the variable n with the number six. Remember to follow the order of operations and solve inside the parenthesis first. So, six minus two is four. One-hundred-eighty degrees multiplied by four is sevenhundred-twenty And there you have it A hexagon, also known as a polygon with six sides, has a total interior angle sum of seven-hundred-twenty Good show! Let s gather ourselves here for a sec. Think you re ready to go forward? Or do you think you need to watch that again, just to make sure you ve got it? Model 2 And we re back! Lord Rottington s ready to show you how to use the formula to find the total sum of the interior angles in other polygons. Excited? I am! Let s get to it! Who doesn t love a good formula every now and again? Helps to keep order and you know how I love order.
3 So this time, you re going to use the formula to find the total sum of the interior angles in a twelve-sided polygon. Twelve sides? My, my my A polygon can have any number of sides, Antonio. Here s how the formula works with twelve So remember, the formula is one hundred-eighty degrees multiplied by the difference of n minus two. n, you ll recall, represents the number of sides in the polygon. To find the total sum of the angles in a twelve-sided polygon, substitute the variable n with the number twelve. Following the order of operations, first you subtract two from twelve, then multiply onehundred-eighty degrees by difference, ten. And there you see that the sum of the interior angles in a twelve-sided polygon is onethousand-eight-hundred Now, Antonio. How do you think we could use the formula to find the total sum of the interior angles for a polygon with twenty-sides? Oh, my my my. Twenty sides. (mumbles a bit) Let s see here. I d use the formula, one hundred eighty degrees multiplied by the difference of n minus two; n being the number of sides in the polygon, of course. Since I know the shape has twenty sides, I d substitute the variable n with the number twenty. To find the answer, first I d subtract two from twenty, to get eighteen and multiply onehundred-eighty by eighteen. And hooray! The sum of the interior angles in a polygon with twenty blazing sides is three thousand two-hundred-forty
4 That went swimmingly, old chap! Thank you, sir. Did that go swimmingly for you, too? Or is the formula still a bit foreign to you? Tell me what you want to do and that s what we ll do. Model 3 our last go round, let s see if you can find an angle measurement inside a polygon. Take it away, Lord Rottington! Let s see here. Ah, yes! Before I m off to tea time, let me share with you the last thing I think every practitioner of polygons should know. Tell me What s the missing angle measurement in the polygon shown below? Well, as you can see, this polygon has five sides. To find the angle measure, you first need to know the sum of all the angles in the polygon. Using the formula, one-hundred-eighty degrees multiplied by the difference of n minus two, you can deduce that the sum of all the interior angles is five-hundred-forty. Now, since you want to find the missing value, you need to add the known angle measurements. One-hundred-twenty-five plus ninety plus one-hundred-thirty plus onehundred-ten equals four hundred fifty-five. Solving the equation by subtracting four hundred fifty-five on both sides, you can find the missing angle measurement to be eighty-five That seemed complicated. It couldn t be simpler than this, my friend. Here it is, short and sweet. First, you find the total sum of the interior angles for the polygon. Second, you add the known values of the angles in the polygon. Finally, you subtract the values from the sum of the interior angles of the polygon.
5 Thank you sir! Alrighty! How re ya doin? Ready to tackle real problems? Or do you think you need to go through that one more time, for good measure? End of Activity Review Well, we covered a lot of ground today, huh? Let's go over it again. In this activity, you used the formula one-hundred-eighty degrees multiplied by the difference of n minus 2 to find the total of the interior angle sums in polygons. Here, n represents the number of sides in the polygon. You also learned to find the missing angle measure of a polygon. First, you found the total sum of the interior angles for the polygon. Next, you added the known values of the angles in the polygon. Finally, you subtracted the values from the sum of the interior angles of the polygon. You rule! And here s the perfect place to take a breather, in case you re not quite ready to move on. Or are you? You tell me.
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