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What is the area of the region inside the square not covered by the four triangles?

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A square has a side length of 50 cm. Four right triangles with legs of 40 cm and 30 cm are placed along the four corners of the square, as shown below.
enter image description here
What is the area of the region inside the square not covered by the four triangles?

posted Oct 18 by Saif Khanam

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