geometry
posted by sab .
the measure of an angle of a parallelogram is 12 degrees less than 3 times the measure of an adjacent angle. explain how to find the measures of all the interior angles of the parallelogram.

well, you know that in a gram, the adjacent angles must add up to 180°
let one angle be Ø,
the other is 3Ø12
solve Ø + 3Ø12 = 180
etc