hal forgot the number of people at the basketball game. he does remember that the number had four digits and a 3 in the tens pla
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8+x= 
=> 8+x = 15 => x = 15-8=7
EG and FH are diagonals of the rhombus and the bisect each other at the centre to for a righ angle triangle with the side of the rhombus as the hypothenus.
By pythagoras theorem,
By pythagoras theorem,