Find the lenght of the diagonal of rectangle whose sides are 21 cm and 20 cm
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Do with the help of pythagouras therom
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Consider a rectangle ABCD
AB = 21 cm
AD = 20 cm
Sides of a rectangle intersect at an angle of 90°
Diagonal of rectangle = BD
In ΔABD
BD² = AD² + AB²
BD²= 20² + 21²
BD² = 400 + 441
BD² = 841
BD = 29
length of diagonal = 29
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