Second, if a transversal intersects two lines so that interior angles on the same side of the transversal are supplementary, then the lines are parallel.
42.
To prove proposition 29 assuming Playfair's axiom, let a transversal cross two parallel lines and suppose that the alternate interior angles are not equal.
43.
A sharp interior angle in this region can interact with the boundary layer flow causing a drag inducing vortex, negating some of the benefit of the winglet.
44.
Note that if we interpret each brick face as a hexagon having two interior angles of 180 degrees, we can now accept the pattern as a proper tiling.
45.
There are a few black and brown speckles, and a broad brown streak, which extends from near the tip of the white mark to the interior angle.
46.
Now the interior angle of the triangle " OPR " at O is one third of the triangle's exterior angle at " R ".
47.
:: : Thanks for that . . . everyone who has said the interior angle is 108? not 72?is correct-I gave the central angle not the interior.
48.
Clearly, the sum of angles on the " outside " now is 180?and at each vertex, the sum of the interior angle and exterior angle is 360?
49.
The proposition continues by stating that on a transversal of two parallel lines, corresponding angles are congruent and the interior angles on the same side are equal to two right angles.
50.
The bottom plot in the figure to the left represents the angular distance from the observed pointing to the zenith, which is opposite to the interior angle located at the sun.
