QUESTION IMAGE
Question
- two circles share the same center as pictured below. the small circle has a radius of 4 feet. the larger circle has a radius of 9 feet. what is the area, in square feet, of the shaded region rounded to the nearest tenth? square feet
Step1: Formula for the area of a circle
La fórmula para el área de un círculo es \( A = \pi r^{2} \), donde \( r \) es el radio.
Step2: Área del círculo grande
Para el círculo grande con \( r = 9 \) ft, \( A_{1}=\pi\times9^{2}=81\pi \).
Step3: Área del círculo pequeño
Para el círculo pequeño con \( r = 4 \) ft, \( A_{2}=\pi\times4^{2}=16\pi \).
Step4: Área de la región sombreada
La región sombreada es \( A = A_{1}-A_{2}=(81\pi - 16\pi)=65\pi \).
Sustituyendo \( \pi\approx3.14 \), \( A = 65\times3.14=204.1 \).
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204.1