find the perimeter of the rectangle whose length is 40 cm and a diagonal is 41 cm
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The diagonal of the rectangle divides it into two right-angled triangles, so we can use the pythagorean theorem to solve this problem. 41cm is the diagonal and 40cm is the length.hyp² = length² + breadth²41² = 40² + breadth²1681 = 1600 + breadth²1681 - 1600 = breadth²breadth² = 81breadth = √81= 9cmPerimeter = 2( l + b ) = 2 * (40 + 9) = 2 * 49 = 98cmThe perimeter of the rectangle is 98cm
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