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Question #2fd6c

1 Answer

Mar 13, 2017

The length is #=13.2cm#

Explanation:

We apply Pythagoras' theorem

#a^2+b^2=c^2#

#a^2+15^2=20^2#

#a^2=20^2-15^2#

#a=sqrt(20^2-15^2)#

#a=13.2cm#

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