The diameter of a circle is 20 m . Find its area in terms of \( \pi \). Answer Attempt 1 out of 2 \( A=\square \mathrm{m}^{2} \)
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To find the area of a circle, use the formula \( A = \pi r^2 \), where \( r \) is the radius. Since the diameter is 20 m, the radius \( r \) is half of that: \( r = 10 \) m. Plugging that into the formula gives us \( A = \pi (10)^2 = 100\pi \, \text{m}^2 \). So, the area is \( 100\pi \, \text{m}^2 \). Math has been around for thousands of years, and the ancient Greeks, including Euclid, were instrumental in developing geometric principles. They formalized formulas for areas and volumes, including the circle's area, allowing mathematicians today to apply these age-old concepts in various fields, from architecture to engineering. In real-world applications, understanding the area of a circle can help in numerous situations, such as designing circular gardens, calculating material needs for round tables, or even planning sports fields. For example, if you’re designing a circular pool, knowing its area will help you estimate the volume of water needed, ensuring you don’t fill it more than necessary!