Each row of the table shows two of the interior angle measures of two triangles.

which triangles are similar?

choose similar or not similar for each pair of triangles.
triangles similar not similar
triangle 1: 80°, 62°

triangle 2: 62°, 38°

triangle 1: 29°, 47°

triangle 2: 91°, 76°

triangle 1: 100°, 45°

triangle 2: 25°, 45°

We all know that the interior angles of a triangle sums up to 180°. To get the missing angle, we simply subtract the sum of the given angles from 180°

Similar triangles have the same measure of angles. 

Triangle 1: 80°, 62° → 180 - 80 - 62 = 38°

Triangle 2: 62°, 38° → 180 - 62 - 38 = 80°   SIMILAR TRIANGLES

Triangle 1: 29°, 47° → 180 - 29 - 47 = 104°

Triangle 2: 91°, 76° → 180 - 91 - 76 = 13°    NOT SIMILAR

Triangle 1: 100°, 45° → 180 - 100 - 45 = 35°

Triangle 2: 25°, 45° → 180 - 25 - 45 = 110°  NOT SIMILAR