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RANGKUMAN MATEMATIKA KELAS 8 SEMESTER 2

RANGKUMAN MATEMATIKA KELAS 8 SEMESTER 2. Created by ﺠﻴﻄ for mathlabsky.wordpress.com. Created by ﺠﻴﻄ for mathlabsky.wordpress.com. CIRCLE. 1. Basic terms. Radius (jari-jari) : any segment that joins the center to a point of the circle

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RANGKUMAN MATEMATIKA KELAS 8 SEMESTER 2

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  1. RANGKUMAN MATEMATIKA KELAS 8 SEMESTER 2 Created by ﺠﻴﻄ for mathlabsky.wordpress.com Created by ﺠﻴﻄ for mathlabsky.wordpress.com

  2. 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

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

  4. 3. Sector and Arc Sector (juring) Arc (busur) B B C A a0 Sector • O • O b0 a0 Arc D A

  5. 4. Inscribed and Central Angle 3 2 A 1 A B A B B O O O • • • • C C D C ABC = 900 ACB = ADB AOB = 2ACB A D 4 c a b b O a d c C B a x b = c x d a + b = c BAD + BCD = 1800

  6. 5. Tangent A ● • O P ● ● B AP = BP

  7. Common internal tangent AB = Tangent PQ = Distance of two centrals r = radius B P • • • • Q A A B P Q Common external tangent

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