The measure of angle B is 100° if A & B are supplementary angle.
The angle in a straight line says that the sum of all the angles on a straight line is 180°.
opposite vertical angle is the two opposite angles on a parallel line at the point of intersection.
angle y=80°
The angle on a straight line is 180°
angle y+80=180°
z=180°-80
z=100°
Supplementary angles are those angles that sum up to a hundred and eighty tiers. for example, angle 80° and attitude are supplementary angles due to the fact sum of one hundred thirty° and 100° is identical to a hundred and eighty°.
If the sum of two angles is a hundred and eighty ranges then they're stated to be supplementary angles, which shape a linear perspective collectively. while if the sum of angles is 90 ranges, then they're said to be complementary angles, and they shape a right angle collectively.
Learn more about Supplementary angle here:-https://brainly.com/question/404323
#SPJ2
