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.

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Presentation transcript:

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 Example Radius : OA, OB, OC, OD, OE, OF Arc B Sector C Chord : FE, AF, AD Diameter : AD Arc : 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. Circumference and Area of Circles Formula: Circumference (Keliling) or Area (Luas) or C = Circumference A = Area D = Diameter r = Radius D = 2 r

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

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

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

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

b. 7 cm 15 cm

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

d. 10 cm

I e. 7 cm II III Circumference = 44 cm

 f. 3 cm 2 cm Annulus