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A square has side 20 cm. One circle is drawn through its four corners and a second circle is drawn inside it touching all four sides. Find the ratio of the area of the larger circle to the area of the smaller circle.

Competition practiceAreas & Volumes
  • A1:2
  • B√2:1
  • C2:1
  • D4:1

Step-by-Step Solution

The circle through the corners has the square's diagonal 20√2 cm as its diameter, so its radius is 10√2 cm and its area is 200π . The circle touching the sides has radius 10 cm and area 100π . Ratio = 200π : 100π = 2 : 1.
Answer: C) 2:1

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