{"id":21738,"date":"2016-02-17T22:52:23","date_gmt":"2016-02-17T22:52:23","guid":{"rendered":"http:\/\/www.mometrix.com\/academy\/?page_id=21738"},"modified":"2025-12-09T10:50:16","modified_gmt":"2025-12-09T16:50:16","slug":"5th-grade-math-width-length-perimeter","status":"publish","type":"page","link":"https:\/\/www.mometrix.com\/academy\/5th-grade-math-width-length-perimeter\/","title":{"rendered":"Length, Width, and Perimeter"},"content":{"rendered":"<h1>Length, Width, and Perimeter | 5th GRADE Math Review<\/h1>\n<div class=\"lyte-wrapper fourthree\" title=\"5th Grade Math Width, Length, Perimeter\" style=\"width:420px;max-width:100%;margin:5px auto;\"><div class=\"lyMe\" id=\"WYL_m82geCo_ySM\"><div id=\"lyte_m82geCo_ySM\" data-src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/plugins\/wp-youtube-lyte\/lyteCache.php?origThumbUrl=https%3A%2F%2Fi.ytimg.com%2Fvi%2Fm82geCo_ySM%2Fhqdefault.jpg\" class=\"pL\"><div class=\"tC\"><div class=\"tT\">5th Grade Math Width, Length, Perimeter<\/div><\/div><div class=\"play\"><\/div><div class=\"ctrl\"><div class=\"Lctrl\"><\/div><div class=\"Rctrl\"><\/div><\/div><\/div><noscript><a href=\"https:\/\/youtu.be\/m82geCo_ySM\" rel=\"nofollow\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/plugins\/wp-youtube-lyte\/lyteCache.php?origThumbUrl=https%3A%2F%2Fi.ytimg.com%2Fvi%2Fm82geCo_ySM%2F0.jpg\" alt=\"5th Grade Math Width, Length, Perimeter\" width=\"420\" height=\"295\" \/><br \/>Watch this video on YouTube<\/a><\/noscript><\/div><\/div><div class=\"lL\" style=\"max-width:100%;width:420px;margin:5px auto;\"><\/div>\n<div class=\"accordion\"><input id=\"transcript\" type=\"checkbox\" class=\"spoiler_button\" \/><label for=\"transcript\">Transcript<\/label>\n<div class=\"spoiler\" id=\"transcript-spoiler\">\n<p>Time for another happy studying session with Mometrix Academy. Hi, and welcome to this video lesson on width, length, and perimeter of parallelograms.<\/p>\n<p>Sometimes in math we&#8217;re asked to find the width, length, or perimeter of a parallelogram, which is kind of like a rectangle, or kind of like this. Yeah, that wasn&#8217;t very good. When we&#8217;re trying to find unknown widths or lengths of parallelograms, it helps us to be able to use equations.<\/p>\n<p>This isn&#8217;t as hard as it sounds, let&#8217;s take a look at an example. Say we have a rectangle with length, a, and width, b. Describe the perimeter and write an equation to represent the perimeter of the rectangle. The perimeter of a rectangle is the sum of the length of the sides of the rectangle. The perimeter of the rectangle can be shown as a plus a, plus b, plus b, or 2a plus 2b.<\/p>\n<p>Now that we know the equation that will be the key to solving any perimeter problem we have, let&#8217;s start adding known numbers to this equation. First, say we are given this picture. In this picture we are given two things, the perimeter and a side, so let&#8217;s set up our equation. Perimeter is equal to 2A + 2B, right?<\/p>\n<p>Let&#8217;s put in our known quantities. 34 is our perimeter, and that is equal to 2 times A, or in this case, 7, plus 2B. We can simplify this a little bit more. 34 is equal to 14 plus 2B. Now, let&#8217;s go ahead and get the unknown B by itself, by subtracting 14 from both sides of this equation. 14 from 34 is equal to 20, and 14 away from 14 plus 2B, is equal to just 2B.<\/p>\n<p>Now we have 20 is equal to 2B. Let&#8217;s go ahead and solve the rest of this equation, dividing by two on each side. 20 divided by two is equal to 10, 2B divided by 2 is equal to B. Now we have B alone, and we solve for B. Now we know the lengths of all the sides on this rectangle. Let&#8217;s try one more, this time by yourself.<\/p>\n<p>The perimeter is 26 and we have sides x and 3. Remember, set up your equation, then attempt to get the unknown alone by doing the same thing to both sides. Remember the width on this rectangle is 3 on each side, and the length is x on each side, which means we have 2(3) plus 2x is equal to the perimeter of 26. Let&#8217;s go ahead and simplify this equation.<\/p>\n<p>Now we have to get x alone, that requires some division, so let&#8217;s go ahead and do that. Finally, we see that x is equal to 10 once more. I hope that helps. Thanks for watching this video lesson, and until next time, happy studying. Yeah, really gonna get rid of that.<\/p>\n<\/div>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Length, Width, and Perimeter | 5th GRADE Math Review<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":{"0":"post-21738","1":"page","2":"type-page","3":"status-publish","5":"page_category-area-and-perimeter-videos","6":"page_category-math-advertising-group","7":"page_type-video"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Width, length, and perimeter are fundamental math concepts in geometry. 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