A circle has the largest square in it. The diameter of the circle is 20 cm. Find the area of the square

The diagonal of a square is equal to the diameter of a circle. The square can be divided into two isosceles triangles along the diagonal. The sum of the areas of the two triangles is equal to the area of the square
The area of a square = bottom length / 2 × height × 2 = 20 / 2 × 10 × 2 = 200 square centimeters

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