The ratio of the area to the circumference of a circle is 5/4. what is the circumference of the circle?

The circumference of the circle is 16.

Step-by-step explanation:

Given:

The ratio of the area to the circumference of a circle is 5/4.

Now, to find the circumference of the circle.

So, we get radius(r) first to find circumference.

For, getting radius(r) we use the proportion:

Now, putting formula to solve it:

⇒

On solving we get:

⇒

By multiplying with 2 on both sides we get:

⇒

⇒

⇒

Radius = 2.5.

Now, putting the formula to get the circumference:

Taking the value of π = 3.14.

Circumference = 16 (approximately).

Therefore, the circumference of the circle is 16.

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.