Question

find the circumference and area of the circle. express answers in terms of π and then round to the nearest tenth.
find the circumference in terms of π
c = 18π cm (type an exact answer in terms of π.)
find the circumference rounded to the nearest tenth.
c = 56.5 cm
find the area in terms of π
a = □ (type an exact answer in terms of π.)

Explanation:

Step1: Formula for area of a circle

La fórmula para el área de un círculo es \( A=\pi r^{2} \), donde \( r \) es el radio.

Step2: Sustituir el valor del radio

Dado que \( r = 9\,\text{cm} \), sustituimos en la fórmula: \( A=\pi\times(9)^{2} \).

Step3: Calcular el valor

\( A = 81\pi\,\text{cm}^{2} \)

Answer:

\( A = 81\pi\,\text{cm}^{2} \)