7/27/2019 Form 2 Maths Circle

1/7

chordchord

arc

arc

7/27/2019 Form 2 Maths Circle

2/7

x

6cm

x

radius

center

chord

90

= 5cm

= 6cm

7/27/2019 Form 2 Maths Circle

3/7

906cm

x

4cm 4cm12cm

x

6cm

6cm

7/27/2019 Form 2 Maths Circle

4/7

PO

Q

R

S T

r

r

gment

7/27/2019 Form 2 Maths Circle

5/7

E

A B

C D

E

O

is ____?

e AD = diameter

e CED = arc

a BOD = sectore AO = radius

e BC = diameter

a CED = segment

e AC = arce BD = arc

e CD = chord

int 0 = center

7/27/2019 Form 2 Maths Circle

6/7

Circumference

= 2r

= 2 x 22/7 x r

amtDiameter = 14 cmRadius = 7cm

Circumference = ______= 2 x 22/7 x 7 = 44 cm

Radius =

44 x 7/22 x = 7 cm

iamtDiameter = 21 cm

Radius = 10.5 cm

Circumference = ______

= 2 x 22/7 x 10.5 = 66 cm

3)

diamtRadius = 7 cm

Circumference = ______

= 2 x 22/7 x 7 = 44 cm

4)

diamtRadius = 14.7 cm

Circumference = ______

= 2 x 22/7 x 14.7 cm = 92.

Radius

= circumference x 7/22 x 1/2

Radius =

44 x 7/22 x = 7 cm

Radius =

66 x 7/22 x = 10.5 cm

Radius =

92.4 x 7/22 x = 14.7 cm

7/27/2019 Form 2 Maths Circle

7/7

Radius

= circumference x 7/22 x 1/2Diame

= 2 x r

47.13 x 7/22 x = 7.5 cm 2 x 7.

15.71 x 22/7 x = 24.69cm 24.69 x

= 3) 20 cm 20 x 2

2.48 = 4) 62.48 cm 62.48

124.9