Question

!!!!!!!!!!!!!!!!!!!!!!!!! pra amanhã!!
Socorro

Answer 1

Resposta: B

Pitágoras 

$a^{2} =b^{2} + c^{2}$

$a^{2}= 600^{2} + 800^{2}$

$a^{2}=1000000 a= \sqrt{1000000} a=1000$

1400-1000=400