When two lines intersect they form two bag of the opposite angles, A + C and B + D. One more word because that opposite angles room vertical angles.

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Vertical angle are constantly congruent, which means that they room equal.

Adjacent angles room angles the come out of the very same vertex. Adjacent angles re-superstructure a common ray and also do no overlap.

The dimension of the angle xzy in the photo above is the amount of the angles A and also B.

Two angles are said to it is in complementary as soon as the sum of the 2 angles is 90°.

Two angles are said to it is in supplementary when the sum of the 2 angles is 180°.

If we have two parallel lines and have a third line that crosses them together in the ficture listed below - the crossing heat is referred to as a transversal

When a transversal intersects with two parallel currently eight angles space produced.

The eight angles will certainly together type four bag of equivalent angles. Angle 1 and also 5 constitutes one of the pairs. Corresponding angles space congruent. All angles that have the same position with regards come the parallel lines and the transversal are corresponding pairs e.g. 3 + 7, 4 + 8 and also 2 + 6.

Angles that space in the area between the parallel lines favor angle 2 and also 8 above are dubbed interior angle whereas the angle that space on the outside of the two parallel lines prefer 1 and also 6 are called exterior angles.

Angles that are on the opposite political parties of the transversal are called alternating angles e.g. 1 + 8.

All angle that room either exterior angles, inner angles, alternative angles or corresponding angles are all congruent.

**Example**

The picture above reflects two parallel lines with a transversal. The angle 6 is 65°. Is there any type of other edge that also measures 65°?

6 and also 8 space vertical angles and also are thus congruent which way angle 8 is likewise 65°.

6 and 2 are corresponding angles and also are thus congruent which means angle 2 is 65°.

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6 and 4 are alternating exterior angles and thus congruent which way angle 4 is 65°.