The diameter of a semicircle is 6cm. The circumference of the semicircle is () and the area is ()

Area formula school, radius square perimeter school, radius square

Is the circumference of a 20 cm circle equal to that of two 10 cm circles? What about the area? Why?

The circumference is the same, you can apply the formula. The results are all the same. No doubt. The circumference of the circle = 2nr
Area = NR * r the face of a 20 cm circle is larger than that of a 10 cm circle

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