Question

find the area.
5 cm
a = ? cm²
a = πr²
use π = 3.14

Explanation:

Step1: Substitute the radius into the formula

Given \( r = 5\) cm and the formula \( A=\pi r^{2}\), substitute \( r = 5\) into it: \(A = 3.14\times5^{2}\).

Step2: Calculate \(5^{2}\)

\(5^{2}=5\times5 = 25\), so the formula becomes \(A = 3.14\times25\).

Step3: Perform the multiplication

\(3.14\times25=(3 + 0.14)\times25=3\times25+0.14\times25=75 + 3.5=78.5\).

Answer:

\(78.5\)