Question

abcd is trapeziam in which ab parallel to dc. if angle a=angle b=30degrees.what are the measures of other two angle

Answer 1

$angle \: a + angle \: d = 180(sum \: of \: interior \: angle \: of \: parallel \: line) \\ 30 + x = 180 \\ x = 180 - 30 \\ x = 150 \\ angle \: b \: + angle \: c = 180 \\ 30 + x = 180 \\ x = 180 - 30 \\ x = 150$