Question -
Answer -
Two supplementary angles are in the ratio 4:5.
Let us say, the angles are 4a and 5a (in degrees)
Since angle are supplementary angles;
Which implies, 4a + 5a = 1800
9a = 1800
a = 200
Therefore, 4a = 4 (20) = 800 and
5(a) = 5 (20) = 1000
Hence, required angles are 80° and 1000.