Vertical Angles are congruent

Vertical Angles are congruent

The sum of the measure of the angles in a linear pair is 180°.

They are supplementary angles.

Supplementary angles:

two angles whose measures have a sum of 180°

Complementary angles:

two angles whose measures have a sum of 90°

Perpendicular lines intersect to form four right angles.

If a line is perpendicular to a plane, then the line must be perpendicular to every line in the plane that intersects it.

Can be assumed from figure:

• All points shown are coplanar

• L, P and Q are collinear

• PM, PN, PO and LQ intersect at P

• P is between L and Q

• N is in the interior of <MPO

• <LPQ is a straight angle

• <LPM and <MPN are adjacent angles

• <LPN and <NPQ are a linear pair

• <QPO and <OPL are supplementary

Cannot be assumed from the figure:

PN ^ PM

<QPO @ <LPM

LP @ PQ, PO @ PN,

PN @ PL, PQ @ PO

<QPO @ <OPN

<OPN @ <LPM

If I use certain symbols it can be assumed for example: