nna is trying to determine if this quadrilateral is an isosceles trapezoid. First, she uses the slope formula and finds that AB || DC. Which other step must Anna take before she makes a determination? A) Use the slope formula to determine if AD || BC. B) Use the distance formula to determine if AB = CD. C) Use the distance formula to determine if AD = BC. D) Use the slope formula to determine if AD ⊥ AB.
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