#### Answer

length=12 cm

#### Work Step by Step

In a rectangle diagonal make two congruent right triangles.
So by Pythagoras theorem
$Diagonal^{2}= width^{2}+length^{2}$
$20^{2}=16^{2}+length^{2}$
$400=256+length^{2}$
$144=length^{2}$
length=12 cm

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Published by
Brooks Cole

ISBN 10:
9781285195698

ISBN 13:
978-1-28519-569-8

length=12 cm

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