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Question Number 102196 by mathocean1 last updated on 07/Jul/20

A B C D i s a s q u a r e w i t h c e n t e r O .

A B = 5 c m .

E F G H i s a s q u a r e s u c h a s

A E = B F = C G = D H .

1) S h o w w i t h C h a s l e s r u l e s t h a t

\vec{E F} . \vec{F G} = \vec{0}

2) D e t e r m i n a t e t h e a r e a o f E B F O

a c c o r d i n g t o t h e a r e a o f A B C D .