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## Corresponding angles - Wikipedia

en.wikipedia.org/wiki/Corresponding_angles

In geometry, a transversal is a line that passes through two lines in the same plane at two ... cuts two parallel lines at right angles is called a perpendicular transversal. ... Further, if the ang...

## Vertical Angles definition - Math Open Reference

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.

## Types of Angles - Regents Exam Prep Center

www.regentsprep.org/regents/math/geometry/gp5/langles.htm

An angle is the intersection of two rays with a common endpoint. ... They are always equal in measure. <1 and <3 are vertical angles. <2 and ... THEOREM: Complements of the same angle, or congruent angles, are congruent. Supplementary ...

## euclidean geometry - Explain why vertical angles must be congruent ...

math.stackexchange.com/questions/286114/explain-why-vertical-angles-must-be-congruent

Jan 24, 2013 ... Explain why vertical angles must be congruent .... The non-adjacent angles are called vertical or opposite . Also, each pair of adjacent angles ...

## Proving Vertical Angles Are Congruent - For Dummies

www.dummies.com/how-to/content/proving-vertical-angles-are-congruent.html

... to make an X, angles on opposite sides of the X are called vertical angles. ... Vertical angles are congruent: If two angles are vertical angles, then they're ... Finally, angle 3 and angle 6 are congruent vertical angles, so angle 6 must be 145° ...

## Types of Angles: Vertical, Corresponding, Alternate Interior & Others ...

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.

## Cool math .com - Types of Triangles

www.coolmath.com/reference/triangles-types

Since the sum of the angles of a triangle is always 180 degrees... y + z = 90 degrees. The two sides of the triangle that are by the right angle are called the legs... ... all the sides are the same length (congruent) and all the angles are the same ...

## Pairs of Angles | Wyzant Resources - Tutors

www.wyzant.com/resources/lessons/math/geometry/lines_and_angles/pairs_of_angles

Another special pair of angles is called supplementary angles. One angle is said to be the ... Vertical angles always have equal measures. ?JKL and ?MKN are ...

## Building Blocks - Angles and intersecting lines - In Depth - Math.com

www.math.com/school/subject3/lessons/S3U1L5DP.html

Vertical angles are pairs of angles formed by two intersecting lines. ... in four corresponding pairs that have the same measure, so therefore are congruent. ... area between the two lines that are cut by the transversal, are called interior angles.

## Vertical angles are congruent proof | Vertical, complementary, and ...

Proving that vertical angles are equal. ... Identifying supplementary, complementary, and vertical angles · Complementary ... Vertical angles are congruent proof.

### Angles and parallel lines (Pre-Algebra, Introducing geometry ...

www.mathplanet.com

Vertical angles are always congruent, which means that they are equal. ... that are on the outside of the two parallel lines like 1 and 6 are called exterior angles.

### Congruent Angles - Math is Fun

www.mathsisfun.com

Congruent Angles have the same angle (in degrees or radians). That is all. Congruent Angles These angles are congruent. They don't have to point in the same ...

### Vertically Opposite Angles - Math is Fun

www.mathsisfun.com

Vertically Opposite Angles are the angles opposite each other when two lines cross. "Vertical" in ... (in fact they are congruent angles) ... Angles a° and c° are also vertical angles, so must be equal, which means they are 140° each. ... Language Note: "Vertically Opposite Angles" are usually called Vertical Angles ...