• The diameter of a circle is twice the radius, so the diameter of this circle is 20 cm.
• The circumference of a circle is given by the formula C = πd, where d is the diameter. Substituting the value of diameter, we get:C = π(20) = 20π cm (approx. 62.83 cm)
• The area of a circle is given by the formula A = πr^2, where r is the radius. Substituting the value of radius, we get:A = π(10)^2 = 100π cm^2 (approx. 314.16 cm^2)
Thus, the diameter of the circle is 20 cm, the circumference is 20π cm (approx. 62.83 cm) and the area is 100π cm^2 (approx. 314.16 cm^2).