If every pair of consecutive angles of a quadrilateral are supplementary, then the quadrilateral must be parallelogram? true or false?

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce