Question

c= 6.28
a=

10 in

c=
a=

Explanation:

Step1: Find the radius

Given diameter \(d = 10\) in. Radius \(r=\frac{d}{2}=\frac{10}{2}=5\) in.

Step2: Calculate the circumference

Circumference formula \(C = 2\pi r\) (or \(C=\pi d\)). Using \(C=\pi d\), with \(\pi\approx3.14\) and \(d = 10\), we have \(C=3.14\times10 = 31.4\) in.

Step3: Calculate the area

Area formula \(A=\pi r^{2}\). Substitute \(r = 5\) and \(\pi\approx3.14\), so \(A=3.14\times5^{2}=3.14\times25 = 78.5\) in².

Answer:

\(C = 31.4\) in, \(A = 78.5\) in²