The sum of the diameter, perimeter and radius of a circle is 18.56 cm. The diameter of the circle is () cm and the area is () square cm Come back quickly! Come back before 9:00 tonight
Let the radius be x cm, the diameter be 2x cm and the circumference be 6.28x cm
X+2X+6.28X=18.56
X=2
The radius is 2 cm
Diameter 2 × 2 = 4cm
Area = 2 × 2 × 3.14 = 12.56 square centimeter
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