Question

Which of the following are NOT sufficient to prove that a quadrilateral is a parallelogram?

I. Two pairs of opposite angles congruent.
II. A pair of adjacent angles are supplementary.
III. Both pairs of opposite sides are congruent.
IV. A pair of opposite angles congruent and a pair of opposite sides congruent.
V. Both pairs of opposite sides are parallel.
VI. A pair of opposite sides parallel and the other pair of opposite sides congruent.
VII. One pair of opposite sides are both parallel and congruent.
VIII. The diagonals bisect each other.

Answer 1

II, VI, and VII
II and VI
IV and VII
II, IV, and VII


3.

If quadrilateral ABCD is a parallelogram, then which of the following statements must be true?


A D
mA + mD = 90°
mA + mC = 180°
mB + mC = 180°












Session Complete

Answer 2

which part are we answering?

Answer 3

since VII is good; that leaves (b) to check as the answer

Answer 4

uh the last part idk where it came from just the top vii and stuff

Answer 5

(b) is not sufficient.

Answer 6

so its b

Answer 7

i believe its b; I know VII is good, and all the rest have VII as bad soooo....b by default and also by logic, its elements are not sufficient

Answer 8

ur right