How to Calculate the Area of a Circle: Example with 20 mm Diameter
Learn how to calculate the area of a circle with a 20 mm diameter using the formula A = πr².
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To find the area of a 20 mm diameter circle: The formula is A = πr², where r is the radius. Since the diameter is 20 mm, the radius is 10 mm. Plugging in the values, we get A = π × 10² = 100π. Therefore, the area is approximately 314.16 square mm.
FAQs & Answers
- What is the formula to find the area of a circle? The formula for the area of a circle is A = πr², where 'r' is the radius of the circle.
- How do you convert diameter to radius? To convert diameter to radius, simply divide the diameter by 2.
- What is the area of a circle with a 10 mm radius? Using the formula A = πr², the area would be approximately 314.16 square mm for a 10 mm radius.
- Why is π important in circle calculations? π (pi) is a fundamental mathematical constant that represents the ratio of a circle's circumference to its diameter, essential for calculations involving circles.