standard_description: (+)Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant.
problem_activity: Identify the strategy that the student below used to find the measure of
$${BA}$$
. Then, describe a different method for finding this value, describing how you know that the two triangles are dilations of one another.
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aligns: no