Does supplementary angles have a sum of 90

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)