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The section defines perimeter as a sum of side lengths and distinguishes linear units for perimeter from square units for area. It provides formulas for rectangles (P=2l+2w, or 2(l+w)), squares (P=4×side), and general addition for other shapes, followed by worked examples and practice plus an answer key with friendly steps. Word problems connect perimeter to real fencing and frame measurements.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/grade-3-math-chapter-8-section-83-perimeter-of-polygons-study-notes/498747/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/grade-3-math-chapter-8-section-83-perimeter-of-polygons-study-notes/498747.png","ImageObject",300,407,{"name":92,"@type":93},"pixelkiddo","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-10","2026-10-03",true,{"@type":102,"interactionType":103,"userInteractionCount":39},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does perimeter mean in Grade 3 math?","Question",{"text":112,"@type":113},"Perimeter is the total distance around a closed shape. 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For polygons, just add up the side lengths.  \n\n| Formula |\n| --- |\n| Perimeter = sum of all side lengths |\n| Rectangle: P = 2 × l + 2 × w |\n| Square: P = 4 × side |\n\n_ Key Concepts  \n1. Perimeter is the total distance around a closed shape. Add up every side length.  \n2. For a rectangle, there are 2 pairs of equal sides, so P = 2l + 2w (or 2(l + w)) .  \n3. For a square, all 4 sides are equal, so P = 4 × side.  \n4. Perimeter is measured in single (linear) units—inches, feet, meters—never square units. Square units are for area.  \nWorked Examples  \n➀ A rectangle is 9in long and 5in wide. What is its perimeter?¬ Use the formula: P = 2l + 2w = 2 × 9 + 2 × 5 = 18 + 10 = 28 in.  \n􀀑 Answer: 28 in  \n\n| ➁ | A square has sides of 6 cm. What is its perimeter? |  |\n| --- | --- | --- |\n| ¬ | All four sides are 6 cm: P = 4 × 6 = 24 cm. | 􀀑 Answer: 24 cm |\n\n➂ A triangle has sides 3ft, 4ft, and 5ft. What is its perimeter?¬ Just add: 3 + 4 + 5 = 12ft.  \n􀀑 Answer: 12ft  \n✎ Practice Problems  \nFind the perimeter (or missing side) .  \n1. Rectangle: l = 8, w = 3 ⇒ P = ?  \n2. Square: s = 7 ⇒ P = ?    \n3. Rectangle: l = 10, w = 4 ⇒ P = ?  \n4. Triangle: sides 5 , 6 , 7 ⇒ P = ?  \n[1](1 EffortlessMath.com)[ EffortlessMath.com](1 EffortlessMath.com)  \nGrade 3 Math · Chapter 8 — Area & Perimeter  \nSection 8.3  \n8. Rectangle: l = 12, w = 5 ⇒ P = ?  \n9. Pentagon: all sides = 3 ⇒ P = ?  \n10. Hexagon: all sides = 2 ⇒ P = ?  \n11. P = 32, l = 10 ⇒ w = ?    \n12. P = 24 , square ⇒ s = ?    \nStudy Tips  \n☞ Perimeter is in linear units (inches, feet, meters) . Area is in square units (sq in, sq ft) . Don’t mix them up.  \n☞ For a rectangle, you can use P = 2(l + w) as a shortcut: add length and width, then double.☞ For regular polygons (all sides equal), multiply the side length by the number of sides.  \n✍ Word Problems  \n1. Jake wants to put a fence around his rectangular garden that is 10ft long and 6ft wide. How many feet of fencing does he need?  \nAnswer:    \n2. A square picture frame has a perimeter of 36in. What is the length of one side?  \nAnswer:    \n[2](2 EffortlessMath.com)[ EffortlessMath.com](2 EffortlessMath.com)  \nGrade 3 Math · Chapter 8 — Area & Perimeter  \nSection 8.3  \nAnswer Key—with Friendly Explanations  \nPractice Problems  \n1. 2 × 8 + 2 × 3 = 22.  \n􀀑 Answer: 22  \n2. 4 × 7 = 28.  \n􀀑 Answer: 28  \n3. 2 × 10 + 2 × 4 = 28.  \n􀀑 Answer: 28  \n4. 5 + 6 + 7 = 18 .  \n􀀑 Answer: 18  \n5. 4 × 9 = 36.  \n􀀑 Answer: 36  \n6. 2 × 6 + 2 × 6 = 24.  \n􀀑 Answer: 24  \n7. 3 × 4 = 12.  \n􀀑 Answer: 12  \n8. 2 × 12 + 2 × 5 = 34.  \n􀀑 Answer: 34  \n9. 5 × 3 = 15.  \n􀀑 Answer: 15  \n10. 6 × 2 = 12.  \n􀀑 Answer: 12  \n11. P = 2l + 2w, so 32 = 20 + 2w, 2w = 12, w = 6.  \n􀀑 Answer: 6  \n12. 24 ÷ 4 = 6.  \n􀀑 Answer: 6  \nWord Problems  \n1. 2(10) + 2(6) = 32ft of fencing.  \n􀀑 Answer: 32ft  \n2. 36 ÷ 4 = 9 in per side.  \n􀀑 Answer: 9 in  \n[3](3 EffortlessMath.com)[ EffortlessMath.com](3 EffortlessMath.com)  \nWant a Complete Grade 3 Math Program?  \nCheck Out Our California CAASPP Grade 3 Math Bundle!  \nCalifornia CAASPP Grade 3 Math Bundle  \nPractice tests, complete answer keys, and step-by-step explanations  \nEverything a third grader needs to feel ready!  \nTests + Answer Keys One Bundle  \nFind it online:  \n[https://www.effortlessmath.com/product/california-caaspp-grade-3-math-made-ridiculously-simple/](https://www.effortlessmath.com/product/california-caaspp-grade-3-math-made-ridiculously-simple/)  \nImportant: This bundle combines the practice and the explanations into one easy-to-print package designed for Grade 3 students. Made for parents, teachers, and tutors who want everything in one place.  \nFull Practice Tests  \n✓ Complete CAASPP-style practice tests  \n✓ Mirrors the real exam format and difficulty  \n✓ Builds test-taking confidence  \n✓ Aligned with state Grade 3 math standards  \nStart with a full-length p","cbCaipj5RyIbse3E","https://ap.wps.com/l/cbCaipj5RyIbse3E","pdf",434651,"English","# Section 8.3: Perimeter of Polygons\n## Key Concepts\n## Worked Examples\n## Practice Problems\n## Study Tips\n## Word Problems\n## Answer Key with Friendly Explanations","[{\"question\":\"What does perimeter mean in Grade 3 math?\",\"answer\":\"Perimeter is the total distance around a closed shape. You add up every side length to find it.\"},{\"question\":\"Which formula is used for a rectangle’s perimeter?\",\"answer\":\"For a rectangle, use P = 2l + 2w (or the shortcut P = 2(l + w)).\"},{\"question\":\"Why are linear units used for perimeter instead of square units?\",\"answer\":\"Perimeter measures distance around the outside, so it uses single (linear) units like inches or feet. Square units are for area, not perimeter.\"}]","Grade 3 Math - Chapter 8 - Section 8.3 - Perimeter of Polygons - Study Notes | PDF",1790988604]