Divide a circle into several small sectors, and then form an approximate rectangle. The circumference of the rectangle is 24.84 cm, and the area of the circle is () square cm A. 56.52B. 1413C. 28.26D. 2826

Divide a circle into several small sectors, and then form an approximate rectangle. The circumference of the rectangle is 24.84 cm, and the area of the circle is () square cm A. 56.52B. 1413C. 28.26D. 2826

Let the radius of a circle be xcm. & nbsp; & nbsp; 3.14 × 2x + 2x = 24.84, 2x × (3.14 + 1) = 24.84 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2x × 4.14 = 24.84, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 8.28x = 24.84, & nbsp; & nbsp; & nbsp; 8.28x △

Divide a circle into several equal parts to form an approximate rectangle. The circumference of the rectangle is 24.84 cm. What is the area of the circle in square cm?
Ask equation, elder brothers and sisters, uncles and aunts, please

Let the width be x centimeters
2×3.14X＋2X＝24.84
4.14X＝12.42
X＝3
Area: 3.14 × 3 × 3 = 28.26 (square centimeter)

Divide a circle into several small sectors, and then form an approximate rectangle. The circumference of the rectangle is 24.84 cm, and the area of the circle is () square cm
A. 56.52B. 1413C. 28.26D. 2826

Let the radius of a circle be xcm. & nbsp; & nbsp; 3.14 × 2x + 2x = 24.84, 2x × (3.14 + 1) = 24.84 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2x × 4.14 = 24.84, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 8.28x = 24.84, & nbsp; & nbsp; & nbsp; 8.28x △