Two supplementary angles are in the ratio `4:5` . Find the angles.

Explanation

Let unit ratio be` 'x'`, then we know that sum of supplement ary angles is `180^ @`< br> `4x + 5x = 180^ @ `
`=>9x = 180 ^@ `
`x=180/9@x=20@`
`4x=80@`
`5x=100@`
Hence, the angles are `80` degree and `100` degree respectively.