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Published byElinor Lloyd Modified over 6 years ago

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Warm up Get a piece of paper, compass and straight edge. 1.Create an acute angle. Duplicate it. 2.Create and obtuse angle. Duplicate it. 3.Create another obtuse angle. Bisect it. 4.Create another acute angle. Bisect it. 5.Create segment AB. Construct a perpendicular bisector.

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1.8 Perimeter, Circumference, & Area ♥ Perimeter is the distance around a polygon ♥ Circumference is the distance around a circle. ♥ Area is the number of square units that a shape encloses. ♥ Perimeter is labeled in units ♥ Circumference is labeled in units ♥ Area is labeled in units squared. Really super duper, extra double triple, uber important!!!

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Trapezoid A = (b 1 + b 2 )h 2 b1b1 b2b2 h Parallelogram A=bh b h

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Find the perimeter and area of each figure. P = 5 + 5 + 9 + 9 P = 28 cm A = 5 * 9 P = 45 cm 2 P = 7 + 7 + 7 + 7 P = 28 cm A = 7 * 7 P = 49 cm 2

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10 feet 14 feet 7 feet 6 feet 8 feet 4 feet 7 feet 9 feet P = 7 + 7 + 10 + 14 P = 38 feet P = 8 + 4 + 7 + 6 P = 25 feet A = (b 1 + b 2 )h 2 A = (10 + 14)(6) 2 A = (24)(6)/2 = 72 feet 2 A = (b 1 + b 2 )h 2 A = (6 + 4)(7) 2 A = (10)(7)/2 = 35 feet 2

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Area Addition Postulate 25 sq ft 45 sq ft 13 sq ft 11 sq ft Total area = 94 sq. ft.

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To find the area of the shaded region 1.Find the area of the big shape 2.Find the area of the small shape 3.Subtract them 7 units 10 units 3 units 4 units Area of large shape = 70 sq units Area of small shape = 12 sq units Area of shaded region = 58 sq units.

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White Board Time

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090 00 2 876543215 1 004987654321039876543210987654321021987654321098765432100 HoursMinutesSeconds Doodle Time Timer

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090 00 1 876543215 0 004987654321039876543210987654321021987654321098765432100 HoursMinutesSeconds Insert Text Here

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Time’s up! Erase your boards.

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2 2 14 4 4 3 88 6 2 22 sq units 16 4 28 44 sq units 3 12 32

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Find the area and circumference of each circle in terms of π. A = πr 2 A =π (16) 2 A = 256 π units 2 A = πr 2 A =π (3.9) 2 A = 15.21 π units 2 C = 2 πr C = 2π(3.9) C = 7.8π units C = 2 πr C = 2 π (16) C = 32 π units

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Your assignment Pg 70; 5-16, 18-21 Pg 75; 5-21, 23-25, 29-32, 33-42

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