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Circles 9.3 Page 532

Circles 9.3 Page 532. If the diameter is 18 inches, find the radius. B. R = ½ 18 in. R = 9 in. A. C. O. If the radius is 2 ½ ft, find the diameter. D = 2r. D = 2(2.5 ft.). D = 5 feet. The circumference of a circle is the distance around it.

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Circles 9.3 Page 532

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  1. Circles 9.3 Page 532 If the diameter is 18 inches, find the radius. B R = ½ 18 in. R = 9 in. A C O If the radius is 2 ½ ft, find the diameter. D = 2r D = 2(2.5 ft.) D = 5 feet

  2. The circumference of a circle is the distance around it. Finding the circumference is similar to finding the perimeter of a polygon. The number is about 3.14 or 22/7. Find the circumference of the circle. Use 3.14 for pi. 1.4 m C = 3.14 (1.4 m) C = 4.396 m Now try a fraction for the Diameter.

  3. Find the circumference of the circle. Use 22/7 for pi. = = D = 2r 3/4 m

  4. Find the perimeter of this figure. Use 3.14 for pi. 3.2 yd 2 half circles make a whole circle. 7.1 yd 3.2 + 3.2 6.4 We need the Diameter. 20.296 7.1 + 7.1 34.296 P = 7.1 + 7.1 + 3.14(6.4) P = 7.1 + 7.1 + 20.096 P = 34.296 yd

  5. Area of a circle page 535 The area of a circle with radius of length r is given by Using 3.14 14cm Find the area of the circle using 22/7 for pi. 3.14 x 196 1884 28260 28 x 22 56 560 616 31400 28 . 61544 Decimal point A = 616 cm2

  6. Area of a circle page 535 The area of a circle with radius of length r is given by 5km Find the area of the circle using 22/7 for pi. 25 x 22 50 500 550 Using 3.14 3.14 x 25 1570 6280 . 7850 Decimal point

  7. The area of a circle with radius of length r is given by: 10.4 cm Find the area of the circle using 3.14 for pi. A = (3.14)(10.4)(10.4) 10.4 x 10.4 . 416 10816 0000 x 3.14 10400 43264 . 10816 108160 3244800 . 3396224

  8. Which is larger and by how much: a l0 ft square flower bed or a 12 ft diameter flower bed? 12 ft 10 ft r = 6 A = S x S A = 10 x 10 A = 100 sq ft A = 113.04 sq ft 113.04 - 100.00 The 12 ft diameter flower bed is larger by 13.04

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