Question

Find the diameter of a circle whose circumference is 19 cm​

Answer 1

Given

$\bold{Circumference \ of \ the \ circle} = 19 \ cm$

SOMETHING YOU NEED TO KNOW

Circumference of a circle = 2πr

Area of a circle = πr²

Circumference of a semi - circle = πr

Area of a semi - circle = 1/2 πr²

$\implies 2\pi r=19$

$\implies 2 * 3.14 * r = 19$

$\implies 6.28*r=19$

$\implies r = \dfrac{19}{6.28}$

$\implies r = 3.02 \ cm$

Diameter = 2(radius)

                = 2 * 3.02

                = 6.04 cm

                                                       

Answer 2

Answer:

133/22 cm.

Step-by-step explanation:

C of circle = 19 cm

2π r = 19

=> 2× 22/7 × r = 19

=> 44/7 × r = 19

=> 44 × r = 19 × 7

=> r = 133/44

Now,

Diameter = 2r

= 2 × 133/44

= 133/22 cm Ans...