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(the Old Dong-A Ilbo Company Office) 1919 3.1 1 3 .

: , : 102-81-03525 : 2016--0685 : 1

  • 100 . Hong Nam Yang, . 5.2.12 . . .

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The ratio of the lengths of the sides of a rectangle is 3:4. If the perimeter is 56 cm, what is the area of the rectangle?Let sides be \( 3x \) and \( 4x \)Perimeter: \( 2(3x + 4x) = 56 \)\( 14x = 56 \)\( x = 4 \)Sides: 12 cm and 16 cmArea: \( 12 \times 16 = 192 \) square cmA circle is inscribed in a square. If the side of the square is 10 cm, what is the area of the circle?Diameter of circle = side of square = 10 cmRadius = 10/2 = 5 cm