Question

if a party hat has a radius of 3 inches, what is the area of the circular base?
area of a circle ( = pi r^{2} )
( a = square pi mathrm{in}^{2} )

Explanation:

Step1: Substitute the radius into the formula

Given \( r = 3\) inches and the formula \(A=\pi r^{2}\), substitute \(r\): \(A=\pi\times(3)^{2}\)

Step2: Calculate the value of \(r^{2}\)

\((3)^{2}=3\times3 = 9\)

Answer:

\(9\)