Question

the radius is 9 centimeters. which is the closest area of the circles

a.54 cm 2
b.245cm2
c.27 cm 2
d.18 cm 2

Answer 1

The area of a circle is \[\pi r^2,
so what do you do with the given radius? What happens when you multiply the result by pi, whether you use 22/7 or 3.14 or 3.1459?

Answer 2

????????????????????? ._.

Answer 3

The area of a circle is A = pi*r^2 (pi times the square of the radius).

Therefore, when the radius is 9 cm, the square of the radius is 81 cm^2.

Multiplying this by 22/7 (which is an approximation for pi),

\[\frac{ 22*81 cm^2 }{ 7 },\]
which is approximately what value?

And this value is closest to which of the four possible answers given?

Answer 4

area=pir^2
area=3.14*81
area= ??