Question

Find the ratio of the circumferences of two circles whose radii are in the ratio 4:5.
The inner circumference of a circular track is 176 m. The track is 7 m wide Calculate the:
area of the track​

Answer 1

Step-by-step explanation:

Let r

1

be radius of cone circle.

Let r

2

be redius of other circle.

c

1

be circumferences of one circle.

c

2

be cirumferences of other circle.

r

2

r

1

=

6

5

∴ c

1

=2πr

1

c

2

=2πr

2

∴

c

2

c

1

=

2πr

2

2πr

1

c

2

c

1

=

r

2

r

1

c

2

c

1

=

6

5

Answer 2

Answer:

Let r

1

be radius of cone circle.

Let r

2

be redius of other circle.

c

1

be circumferences of one circle.

c

2

be cirumferences of other circle.

r

2

r

1

=

6

5

∴ c

1

=2πr

1

c

2

=2πr

2

∴

c

2

c

1

=

2πr

2

2πr

1

c

2

c

1

=

r

2

r

1

c

2

c

1

=

6

5