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

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%