Find Out the Smallest Angle. If
Answer: (2) 40
The ratio of two angles of a triangle = 4 : 5
Let the measure of two angles = 4 X and 5 X
According to the question,
Then, the third angle = 4 X + 5 X = 9X
As we know that the sum of three angle of a triangle is 180o.
Then, 4 X + 5X + 9X = 180o
18 X = 180o
X = 180/18
X = 10o
Then, the smallest angle is 4 X = 4 x 10
Hence, the answer is (2) 40.