Question

find the length of a diagonal of a rectangle whose sides are 15 centimetre and 8 centimetre

Answer 1

Diagonal=√15²+8²
=17cm

Answer 2

length of diagonal = √[l²+b²)
$= \sqrt{15 {}^{2} + 8 {}^{2} } \\ = \sqrt{225 + 64} \\ = \sqrt{289 } \\ = 17cm$
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