Calculate the circumference and area of the circle if: r = 5 dm, 4 m, 3 cm.
| April 1, 2021 | education
The length of a circle L is equal to twice the product of the radius and the number of mm, the area of the circle S is the product of the square of the radius and the number of mm.
r = 5 dm, L = 2 * 5 * tt = 10 * 3.14 = 31.4 dm;
S = tm * 25 = 3.14 * 25 = 78.5 dm2;
r = 4 m, L = 2 * 4 * tt = 8 * 3.14 = 25.12 m;
S = tt * 16 = 3.14 * 16 = 50.24 m2;
r = 3 cm, L = 2 * 3 * tt = 6 * 3.14 = 18.84 cm;
S = tm * 9 = 3.14 * 9 = 28.26 cm2.
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