Which description does not guarantee that a quadrilateral is a square? question 7 options: has all right angles and has all sides congruent has all sides congruent and all angles congruent is a parallelogram with perpendicular diagonals is both a rectangle and a rhombus

A rectangle, a rhombus, a kite, a trapezoid and a parallelogram are all examples of quadrilaterals which are not square.

Thus a rectangle or a rhombus, or any 4 sided shape that does not have all four sides the same length AND all angles 90 degrees.

So the answer is "is a parallelogram with perpendicular diagonals"

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐