The series was rebooted with a 2014 film, which has also been poorly received.  1 Box Office Mojo: Left Behind Weekend Gross Results. 2  Janaya Stephens, The Making of Left Behind: The Movie. Left Behind: The Movie DVD Special Features. Cloud Ten Pictures, 2005.  3 Rotten Tomatoes: Left Behind: The Movie. January 26, 2001.
Since a triangle has 3 angles that total 180 degrees, it can have only 1 right angle. Since a triangle has 180 degrees and 3 angles, it can only have 1 right angle.
In this right triangle: sin A = a/c; cos A = b/c; tan A = a/b. If one angle of a triangle is 90 degrees and one of the other angles is known, the third is thereby fixed, because the three angles of any triangle add up to 180 degrees. The two acute angles therefore add up to 90 degrees: they are complementary angles.