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 cm²12.56 cm²
B 78.5 cm² 78.5 cm²
To calculate the area of a circle, you use the formula A = πr^2, where r is the radius of the circle. Since the diameter of the hamburger is 5 cm, the radius is half of that, which is 2.5 cm.
Plugging in the radius into the formula, we get A = π(2.5)^2 = 78.5 cm².