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 O A B C D E F G Sector Segment Example Radius : OA, OB, OC, OD, OE, OF Chord : FE, AF, AD Diameter : AD Arc : Arc Apotema : OG Segment : FE Sector : OBC 1.Radius (jari-jari) : any segment that joins the center to a point of the circle 2.Chord (tali busur): a segment that joins two points of the circle 3.Diameter (diameter) : is chord that contains the center of a circle 4.Arc (busur) : is part of a circle 5.Apotema (apotema) : is the distance from center to chord (it must perpendicular to chord) 6.Segment (tembereng) : an area bounded by chord and an arc of the circle 7.Sector (juring) : an area bounded by two radii and an arc of the circle 1. Basic terms

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

3. Sector and Arc O a0a0 A B O A B C D a0a0 b0b0 Sector (juring) Arc (busur) Sector Arc

A C B O A B C D O 1 2  AOB = 2  ACB  ACB =  ADB A B C D O 4  BAD +  BCD = A B C O 3  ABC = 90 0 a b c a + b = c 4. Inscribed and Central Angle b a c d a x b = c x d

O P A B ● ● ● AP = BP 5. Tangent

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