Question

Find the ratio of the areas of two circles whose radii are 4cm and 7cm​

Answer 1

Answer:

Step-by-step explanation:

area of circle when radius is 3cm

22/7*3*3 -------1

area of circle when radius is 4cm

22/7*4*4 ------2

dividing 1 and 2

we have 9/16

hence 9/16 is the ratio

Answer 2

${\underline{\boxed{\color{darkred}{\pmb{\frak{ \; Given \; :- }}}}}}$

• the areas of two circles whose radii are 4cm and 7cm

${\underline{\boxed{\color{navy}{\pmb{\frak{ \; To \; Find \; :- }}}}}}$

• the ratio

${\underline{\boxed{\color{green}{\pmb{\frak{ \; Solution\; :- }}}}}}$

$</p><p>  \sf{r1 = 7cm}</p><p></p><p></p><p>$

$\sf{⇒A1 = π(7) ^{2} = 49π}</p><p>$

$\sf{r2 = 14cm }$

$\sf{⇒A2 = π(14) ^{2} = 196π}</p><p>$

$\bf{A1:A2 = 49π:196π}</p><p>$

$\bf{A1:A2 = 7: 28}$

$\space$

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