Bella thinks that the fraction 4/8 is the simplest form of 2/4 find and correct her mistake
2 answers:
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Let 
be the length of the hypotenuse in the right triangle 
, with 
for 
, the angle opposite the hypotenuse.
By the law of cosines,
But
, so we end up with 
.
By the law of cosines,
But