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en.wikipedia.org/wiki/Transversal_(geometry)

In geometry, a transversal is a line that passes through two lines in the same plane at two ... Further, if the angles of one pair are congruent, then the angles of each of the other pairs are also ... This contradicts Proposition 16 which states that an exterior angle of a triangle is always greater than the opposite interior angles.

socratic.org/questions/what-types-of-angles-are-always-congruent

Jul 28, 2016 ... Right angles ( 90o ) Straight angles ( 180o ) Complete angles ( 360o ) See below ...

www.mathopenref.com/anglesvertical.html

As can be seen from the figure above, when two lines intersect, four angles are formed. Each opposite pair are called vertical angles and are always congruent.

www.mathopenref.com/congruentangles.html

Angles are congruent if they have the same angle measure in degrees. They can be at any orientation on the plane. In the figure above, there are two congruent ...

www.mathplanet.com/education/pre-algebra/introducing-geometry/angles-and-parallel-lines

Vertical angles are always congruent, which means that they are equal. Adjacent angles are angles that come out of the same vertex. Adjacent angles share a ...

www.mathsisfun.com/geometry/congruent-angles.html

Congruent Angles have the same angle (in degrees or radians). That is all. ... the same angle. Congruent - why such a funny word that basically means "equal"?

www.khanacademy.org/math/geometry-home/geometry-angles/geometry-vert-comp-supp/v/proof-vertical-angles-are-equal

Proving that vertical angles are equal. ... Vertical angles are congruent proof ...... angle DBA-- then I'd prove that vertical angles are always going to be equal, ...

study.com/academy/lesson/types-of-angles-vertical-corresponding-alternate-interior-others.html

They are defined as a pair of nonadjacent angles formed by only two intersecting lines. They are known as 'Kissing Vs' and always have congruent measures.

www.varsitytutors.com/hotmath/hotmath_help/topics/vertical-angles-theorem

Vertical Angles Theorem. Theorem:Vertical angles are always congruent. In the figure, ∠1≅∠3 and ∠2≅∠4. Proof: ∠1and∠2 form a linear pair, so by the ...