alleryA convex quadrilateral ABCD, named in order, has ∠A=∠C and ∠B=∠D. Which listed class follows?
AIt is a rectangle
BIt is a parallelogram
CIt is a square
DIt is a rhombus
Answer & Solution
Correct answer: B. It is a parallelogram
Write opposite angles as a,a and b,b. Their total 360° gives a+b=180°, so adjacent angles are supplementary and both pairs of opposite sides are parallel.
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