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Perimeter, Circumference and Area http://player.discoveryeduca tion.com/?blnPreviewOnly= 1&guidAssetId=6e7387cf- 1b6c-4607-9ce3- d9d8dbc34682blnPreviewOnly= 1&guidAssetId=6e7387cf- 1b6c-4607-9ce3- d9d8dbc34682
Perimeter and Circumference Perimeter : The distance around a geometric figure. Circumference: The distance around a circle.
Perimeter To find perimeter add the lengths of all the sides. – Example: Find the perimeter of the polygon 8 in 6 in 8 in 6 in P = 8 + 8 + 6 + 6 P = 28 The perimeter is 28 in
Perimeter – Example : Find the perimeter of the triangle 12 in 16 in P = 12 + 12 + 16 P = 40 The perimeter is 40 in
Your Turn…. Find the perimeter pg. 426 #1-3 ( 3 minutes) Make sure that there are no naked numbers. 1. P = 6 + 4 + 8 P = 18m 2. P = 7 + 5 + 5 + 7 P = 24in 3. P = 8 + 8 + 8 + 8 P = 32 ft
Circumference To find the circumference multiply times diameter, where is 3.14 C = d Diameter
Definitions Diameter (d): a line that passes through the center of a circle Radius (r): half the diameter d = 20, then r = 10 r = 15, then d = 30
Circumference Example: Find the circumference Diameter = 8 in Circumference = d C = 3.14(8) C = 25.12 The circumference is 25.12 in
Circumference Example: Find the circumference radius = 10 cm Circumference = d Diameter = 2r = 2 (10) = 20 C = 3.14(20) C = 62.8 The circumference is 62.8 cm
Your Turn…. Find the circumference pg. 426 # 7-9 No naked numbers. 7. C = d 8. C = d C = 3.14(12) C = 3.14(3) C = 37.7m C = 9.4 ft 9. C = d C = 3.14 (16) C = 50. 2 in
Area of Rectangles The area of a rectangle is the product of its length and width. A = ω ω
Area of Rectangles Find the area of the rectangle 10 ft 7.5 in A = ω A = 10(7.5) A = 75 ft² The area is 75 ft²
Area of Triangles The area of a triangle is half the product of its base b and its height h. A = bh height base
Area of Triangles Example: Find the area of the triangle 6 in 5 in A = bh A = 5(6) A = 15 in ²
Area of Circles The area of a circle is the product of and the square of the circle’s radius r. A = r² radius
Area of Circles Example: Find the area of the circle r = 3 m A = r² A = 3.14(3)² A = 3.14(9) A = 28.26 m ² The area of the circle is 28.26m ²
Area of Circles d = 8 in A = r² Radius = 4 in A = 3.14(4)² A = 3.14(16) A = 50.24 in² The area of the circle is 50.24in²
Lets Review Perimeter = Sum of all sides Circumference = d Area of a Rectangle = ω Area of a Triangle = bh Area of a Circle = r²
Perimeter, Circumference and Area. Perimeter and Circumference Perimeter : The distance around a geometric figure. Circumference: The distance around.
Circumference & Area of a Circle. Definitions Circumference: The distance around a circle. Diameter (d): a line that passes through the center of a circle.
20) 108° 21) 80° 22) 70° 23) 123° 24) 38° 25) 167° 26) 10° 27) 154° 28) 105 = 2x – 11; x = 58 29) 6x x = 180; x = 23.
© 2007 M. Tallman. Perimeter (P)- the distance around a closed figure.
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WU # y +1 < 19 5y +2 -y > 8 -7y -14 4y – 7y -7 < y y + 6 21 y < 2 y - 3 y > -4 y 2.
Do Now 4/17/13 Take out HW from last night. Take out HW from last night. Text p. 362, #1-24 all, 27, 32, 33 Copy HW in your planner. Copy HW in your.
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The distance around the outside of a shape is called the perimeter. 8 cm 6 cm 8 cm 6 cm The perimeter of the shape is = 28cm. First we need.
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Do Now 4/16/13 Copy HW in your planner. Copy HW in your planner. Text p. 362, #1-24 all, 27, 32, 33 In your notebook, define in your own words the following.
Perimeter is the distance around an object. If you started at one point and went all the way around until you got to where you started, the perimeter.
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