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Five-Minute Check (over Lesson 13–9) Main Idea and Vocabulary Example 1: Find the Perimeter by Adding Side Lengths Key Concept: Perimeter of a Square Example 2: Perimeter of a Square Key Concept: Perimeter of a Rectangle Example 3: Perimeter of a Rectangle Lesson Menu
I will find perimeters of polygons. Main Idea/Vocabulary
Find the Perimeter by Adding Side Lengths Find the perimeter of the figure below. Estimate 10 + 0 + 0 + 10 + 5 + 5 = 30 mm Example 1
Find the Perimeter by Adding Side Lengths Add the lengths of each side. = 29.5 Answer: The perimeter of the figure is 29.5 millimeters. This is close to the estimate, so the answer is reasonable. Example 1
Find the perimeter of the figure below. 35 35.3 40.3 70 A B C D Example 1
KC 1
Perimeter of a Square Dyani created a collage for art class using square tiles like the one shown below. What is the perimeter of the tile? 3 Example 2
Answer: The perimeter of the tile is 12 centimeters. Perimeter of a Square P = 4s Perimeter of a square P = 4(3) Replace s with 3. P = 12 Multiply. Answer: The perimeter of the tile is 12 centimeters. Example 2
What is the perimeter of the square below? C D Example 2
KC 2
Perimeter of a Rectangle Kaleb is building a fence around his rectangular garden. The garden is 8 feet long and 6 feet wide. How many feet of fencing will Kaleb need? Example 3
Perimeter of a Rectangle Find the perimeter of the garden. P = 2 + 2w Perimeter of a rectangle P = 2(8) + 2(6) = 8 and w = 6 P = 16 + 12 Multiply. P = 28 Add. Answer: So, Kaleb will need 28 feet of fencing. Example 3
Find the perimeter of the figure. 41 mm 40 mm 39 mm 42 mm A B C D Example 3
End of the Lesson End Lesson
Five-Minute Check (over Lesson 13–9) Image Bank Math Tool Chest Volumes of Prisms Resources
flipping a figure over a line (over Lesson 13–9) Determine whether the transformation is a translation, reflection, or rotation. flipping a figure over a line translation reflection rotation none of the above A B C D Five Minute Check 1
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