El área sombreada que representa la sección comprendida por la intersección entre el rectángulo -1 ≤ x ≤ 1, 0 ≤ y ≤ 1, x2 +y2 ≥ 1 URG

Which statement explains how you could use coordinate geometry to prove that quadrilateral abcd is a parallelogram? -5 -4 -3 -2 -1 t 1 2 3 4 prove that all sides are congruent and have slopes that are opposite reciprocals prove that segments ad and ab are congruent and parallel prove that opposite sides are congruent and have equal slopes prove that segments bc and cd are congruent and parallel

What is the the greatest common factor ?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me