Question

pls do it all 3 I don't understand :(​

Answer 1

πr² : πR² = 49:64

=> r²: R² = 49:64

=> r:R = 7:8

2πr : 2πR = r:R => 7:8

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Answer 2

Ratio of the area of two circles given = 49:64

Area of circle = πr

2

And the area of the first and second circle = πr

1

2

andπr

2

2

Now,

64

49

=

πr

2

2

πr

1

2

⇒

64

49

=

r

2

2

r

1

2

⇒

(8)

2

(7)

2

=

r

2

2

r

1

2

⇒(

8

7

)

2

=(

r

2

r

1

)

2

r

1

=7,r

2

=8

The ratio of circumferences of these two circles-

=

2πr

2

2πr

1

=

r

2

r

1

=

8

7

=7:8