A = 2B + 30
A + B = 180 (definition of "supplementary")
(2B + 30) + B = 180
3B + 30 = 180
3B = 150
B = 50
A = 130
C.120
A pair of angles that add up to 180 degrees. Supplementary angles are very hard first once you hear about them but you will get the hang of itTwo angles that add up to 180 degrees are supplementary
120 Since the measures of the angles of supplementary angles add up to 180, 60 plus something else equals 180. 180-60=120
A supplement to an angle in Geometry is a second angle with a size equal to the difference between 180 degrees and the size of the first angle. If the size of two angles is 180 degrees, then the angles are 'supplementary".
Suppose the angle is x then the second is 5x. The two angles are supplementary so x + 5x = 180 or 6x = 180 so that x = 30 degrees.
First of all, you know the opposite sides of a parallelogram are equal because of the definition of a parallelogram. Therefore, two adjacent angles in the parallelogram are supplementary, because same-side interior angles in two parallels and a transversal are always supplementary. Therefore, opposite angles in a paralellogram are equal, because two angles both supplementary to a third angle are equal to each other.
the other angle has to be 120 degrees, so that both angles add up to 180 degrees.
A rhombus has a pair of opposite equal acute angles and a pair of opposite equal obtuse angles and the four angles add up to 360 degrees.
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The angles are 40, 80 and 60 degrees.
The first was tribal, the second was monarchy, then came oligarchy and finally an experiment with democracy.
to the first three places, it's 0.031