When two adjacent angles form a straight line, they are supplementary.
2.
Also, triangles with two equal sides and an adjacent angle are not necessarily equal or congruent.
3.
Specifying two sides and an adjacent angle ( SSA ), however, can yield two distinct possible triangles.
4.
Let " DEF " be the triangle formed by the intersections of the adjacent angle trisectors of triangle " ABC ".
5.
For example, two lines can intersect in no more than one point, intersecting lines have equal opposite angles, and adjacent angles of intersecting lines are supplementary angles.
6.
Angle " E " is therefore the adjacent angle of a right triangle with hypotenuse, adjacent side, and opposite side sin " ? " } }.
7.
*" Adjacent angles ", often abbreviated as " adj . " s ", are angles that share a common vertex and edge but do not share any interior points.
8.
These follow from the previous proposition by applying the fact that opposite angles of intersecting lines are equal ( Prop . 15 ) and that adjacent angles on a line are supplementary ( Prop . 13 ).
9.
Since in a parallelogram adjacent angles are supplementary ( add to 180?) and " ABC is a right angle ( 90?) then angles " BAD, " BCD, and " ADC are also right ( 90?); consequently ABCD is a rectangle.
10.
Adjacent angles which sum to a right angle, straight angle or full angle are special and are respectively called " complementary ", " supplementary " and " explementary " angles ( see " Combine angle pairs " below ).
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