Given: Circumference of the circle = Area of the circle Formula Used: Circumference of the circle =2πr Area of the circle =πr2 Diameter = Radius × 2 Calculation: According to question 2πr=πr2 ⇒ 2 = r ⇒ Radius = 2 units Diameter = Radius × 2 ⇒2×2=4 units ∴ Diameter is 4 units The correct option is 1 i.e. 4 units