Find the area of a circle with a radius of 4 cm .
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To find the area of a circle, you can use the formula A = πr². Given that the radius (r) is 4 cm, you plug in that value: A = π(4 cm)² = π(16 cm²) = 16π cm². This means the area is approximately 50.27 cm² when you use 3.14 for π. So, this circle is not just round, it’s full of space! But wait, did you know that the concept of a circle has been around since ancient times? The Babylonians had fairly accurate formulas for circles as early as 2000 BC! They understood that circles were special and fascinating. If only they could see how we use geometry today!