Question

Which of the following numbers is closer to the area of a circle with a radius of 2.1

Answer 1

B. 11.33 is closer to the area of a circle with a radius of 2.1

Answer 2

The answer will be C.13.85. A=πr^2, so A=π2.1^2≈13.85. As a result, the area of the circle is about 13.85. Okay, π=3.14, and r^2=2.1×2.1=4.41. Then, 4.41×3.14≈13.85 to find the area of this circle. Hope it help!