Question

..10 The circumference of a circle is 123.2 cm. Calculate :
(i) the radius of the circle in cm.
(ii) the area of the circle in cm2, correct to the nearest cm2.
(iii) the effect on the area of the circle if the radius is doubled.​

Answer 1

$hello \: \: dued \: \: your \: \: answer$

____________________________

a. 19.6 cm

b. 1207.5 cm^2

c. Four times

_____________________________

refer pic above please...for

solution

HOPE IT HELPS YOU....♡♡

Answer 2

$\huge\boxed{\fcolorbox{red} {yellow}{ Answer}}$

ᴄɪʀᴄᴜᴍғᴇʀᴇɴᴄᴇ ( πʀ) = . cm

1) 2πr = 123.2

=> r = (123.2 × 7) / 44 = 19.6 cm

2) Area = πr² = 22 × 19.6 × 19.6 / 7 = 1207.36 cm²

3) If the ratio is doubled then

Area = π4r²

That means the area will be the four times of the previous area

❤