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Sector

CIRCLE. 1. Basic terms. Radius (jari-jari) : any segment that joins the center to a point of the circle Chord (tali busur): a segment that joins two points of the circle Diameter (diameter) : is chord that contains the center of a circle Arc (busur) : is part of a circle

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Sector

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  1. CIRCLE 1. Basic terms • Radius (jari-jari) : any segment that joins the center to a point of the circle • Chord (tali busur): a segment that joins two points of the circle • Diameter (diameter) : is chord that contains the center of a circle • Arc (busur) : is part of a circle • Apotema (apotema) : is the distance from center to chord (it must perpendicular to chord) • Segment (tembereng) : an area bounded by chord and an arc of the circle • Sector (juring) : an area bounded by two radii and an arc of the circle Arc : Example Radius : OA, OB, OC, OD, OE, OF Arc B Sector C Chord : FE, AF, AD Diameter : AD O  A D Apotema : OG G Segment : FE E Sector : OBC Segment F Created by ﺠﯿﻄ for mathlabsky.wordpress.com Created by ﺠﯿﻄ for mathlabsky.wordpress.com

  2. 2. Circumference and Area of Circles Formula: Circumference (Keliling) or Area (Luas) or C = Circumference A = Area D = Diameter r = Radius D = 2 r

  3. Example : find the circumference and area of a circle with the given radius or diameter 1. r = 21 cm 2. D = 20 cm

  4. Exercise • 1. Find the circumference and area of a circle with the radius or diameter . • a. r = 28 cm • b. D = 30 cm • 2. Find the radius of a circle with the given area. • a. A = 36 cm2 • b. A = 6,25 cm2 • 3. The area of a circles is cm2. Find the circumference. • 4. Find the radius of a circle with the given circumference. • a. C = 2 cm • b. C = 25 cm

  5. a. b. 15 cm 7 cm 7 cm c. 10 cm d. 20 cm e. Annulus f. 2 cm 7 cm 7 cm  3 cm Find the circumference and area of each shaded region Click the shape to solve

  6. a. 7 cm I Circumference = 11 + 7 = 18 cm

  7. b. 15 cm 7 cm

  8. I c. 20 cm II III Circumference = 62,8 cm

  9. 10 cm d.

  10. I e. 7 cm 7 cm II III Circumference = 44 cm

  11. Annulus f. 2 cm  3 cm

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