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Holt CA Course 1 10-1 Perimeter Warm Up 1. What figure has four equal sides and four right angles? 2. What figure has eight sides? 3. What figure has five.

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Presentation on theme: "Holt CA Course 1 10-1 Perimeter Warm Up 1. What figure has four equal sides and four right angles? 2. What figure has eight sides? 3. What figure has five."— Presentation transcript:

1 Holt CA Course 1 10-1 Perimeter Warm Up 1. What figure has four equal sides and four right angles? 2. What figure has eight sides? 3. What figure has five sides? square octagon pentagon

2 Holt CA Course 1 10-1 Perimeter AF3.1 Use variables in expressions describing geometric quantities (e.g., P = 2w + 2l, A = bh, C =  d–the formulas for the perimeter of a rectangle, the area of a triangle, and the circumference of a circle, respectively). Also covered: AF1.1, AF1.2, AF3.2 California Standards 1212

3 Holt CA Course 1 10-1 Perimeter Vocabulary perimeter

4 Holt CA Course 1 10-1 Perimeter perimeter the sum of the lengths of a polygon’s sides.

5 Holt CA Course 1 10-1 Perimeter Find the perimeter of the figure. 2.8 + 3.6 + 3.5 + 3 + 4.3 Add all the side lengths. The perimeter is 17.2 in.

6 Holt CA Course 1 10-1 Perimeter Find the perimeter of the figure. 3.3 + 3.3 + 4.2 + 4.2 + 3 Add all the side lengths. 3.3 in. 4.2 in. 3 in. The perimeter is 18 in.

7 Holt CA Course 1 10-1 Perimeter

8 Holt CA Course 1 10-1 Perimeter Find the perimeter P of the parallelogram. P = 2l+ 2w Substitute 12 for l and 3 for w. P = (2 12) + (2 3) P = 24 + 6 P = 30 Multiply. Add. The perimeter is 30 cm. 12 cm 3 cm

9 Holt CA Course 1 10-1 Perimeter Check It Out! Example 2 Find the perimeter P of the parallelogram. P = 2l + 2w Substitute 15 for l and 2 for w. P = (2 15) + (2 2) P = 30 + 4 P = 34 Multiply. Add. The perimeter is 34 cm. 15 cm 2 cm

10 Holt CA Course 1 10-1 Perimeter A. What is the length of side a if the perimeter equals 1,471 mm? P = sum of side lengths Use the values you know. 1,471 = 416 + 272 + 201 + 289 + a 1,471 = 1,178 + a 1,471 – 1,178 = 1,178 + a – 1,178 Add the known lengths. Subtract 1,178 from both sides. 293 = a Side a is 293 mm long. Find each unknown measure.

11 Holt CA Course 1 10-1 Perimeter Find each unknown measure. B. What is the perimeter of the polygon? Step 1: Find b. Find the sum of the lengths opposite side b. b = 50 + 22 b = 72 P = 72 + 55 + 50 + 33 + 22 + 22 P = 254 Step 2: Find the perimeter. The perimeter of the polygon is 254 cm.

12 Holt CA Course 1 10-1 Perimeter Lesson Quiz: Part I Find each perimeter. 1. 2. 9 cm 4 ft 5 6 __

13 Holt CA Course 1 10-1 Perimeter Lesson Quiz: Part II 3. What is the perimeter of a rectangle with length 22 cm and width 8 cm? 4. The width of a rectangle is 12 in. What is the perimeter of the rectangle if the length is 7 in. longer than the width? 60 cm 62 in.


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