Find the area of the circle and the circumference if the diameter is 10 dm.

| February 13, 2021 | education

1) 10: 2 = 5 dm – circle radius; 2) the formula for finding the length of a circle looks like this: L = 2 * pi * r. Where pi is a constant number equal to 3.14 (rounded to the nearest hundredth), r is the radius of the circle. Let’s substitute 5 centimeters in the formula instead of the radius and find the length of this circle. We get: L = 2 * pi * 5 = 10 pi = 10 * 3.14 = 31.4 centimeters: 3) the formula for finding the area of ​​a circle looks like this: S = pi * r squared. Where pi is a constant number equal to 3.14 (rounded to the nearest hundredth), r is the radius of the circle. Substitute 5 centimeters instead of the radius in the formula and find the area of ​​the circle. We get: S = pi * 25 = 25 * 3.14 = 78.5 square centimeters.
Answer: 31.4 centimeters; 78.5 square centimeters.



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