If the area of a circle measures 9π cm2, what is the circumference of the circle in terms of π?
a) 3π cm
b) 6π cm
c)
9/4
π cm
d)
9/2
π cm

option B

Step-by-step explanation:

The circumference of a circle can be calculated with this formula:

Where "C" is the circumference of the circle and "r" is the radius of the circle.

The area of a circle can be calculated with:

Where "r" is the radius.

Knowing the area, you can solve for the radius:

Substituting into  , you get that the circumference of this circle is:

B

Step-by-step explanation:

The area (A) of a circle = πr² ← r is the radius

here A = 9π, hence

πr² = 9π ( divide both sides by π )

r² = = 9

r = = 3

The circumference (C) of a circle is C = 2πr, hence

C = 2π × 3 = 6π → B

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

change of stock price/initial stock price on friday * total stock value = change of stock value

0.89/73.73 *x = 42.72

x=3539.04 = total stock value at initial stock price on friday .

total stock value at initial stock price on friday/ initial stock price on friday = number of shares

3539.04/73.73 = 48 shares

they own 48 shares of this stock