The angle of a triangle abc are in the ratio of 8: 3: 4. what is the measure of the smallest angle?

Well, triangle interior angles = 180 degrees ALWAYS

so we need 180 to basically be in a ratio of 8:3:4

8+3+4 = 15, so the ratio has 15 'parts'

180 / 15 = 12

every 'part' is equal to 12 degrees

so 8:3:4, 3 is the smallest 'part'

3 x 12 = 36 degrees

The answer to your question is 1/9