Brian grilled a hamburger. The diameter of the hamburger was 5 cm. What was the area of burger? Responses A 15.7 cm²15.7 cm² B 78.5 cm²78.5 cm² C 19.625 cm²19.625 cm² D 12.56 cm²
The formula for the area of a circle is A = πr², where r is the radius of the circle. In this case, the diameter of the hamburger is 5 cm, so the radius would be half of that, or 2.5 cm.
Substituting the radius into the formula, we get A = 3.14 * 2.5² = 3.14 * 6.25 = 19.625 cm².
Therefore, the correct answer is option C: 19.625 cm².