Cut the largest circle from a square iron sheet with a side length of 10 cm. What's the circumference of the circle? What's the area? What's the area of the remaining sheet
The diameter of the largest circle is the side length of the square, then the radius of the circle = 10 △ 2 = 5 (CM), the circumference of the circle = 2 π r = 2 × 3.14 × 5 = 31.4 (CM), the area of the circle = π R & # 178; = 3.14 × 5 & # 178; = 78.5 (square cm), the area of the remaining sheet of iron = 10 & # 178; - 78.5 = 21.5 (square cm) a: the circumference of the circle