The circumference of a circle is 12.84 cm longer than its diameter. How many square centimeters is the area of this circle

The circumference of a circle is 12.84 cm longer than its diameter. How many square centimeters is the area of this circle

Radius 12.84 △ 3.14-1 △ 2 = 3cm
Area: 3.14 × 3 × 3 = 28.26 square centimeter