In ∆ABC, the measure of angle A is equal to the sum of the measures of ∠ B and ∠ C. Also the ratio of measures of ∠ B and ∠C is 4 : 5. Then find the measures of angles of the triangle.

In ∆ABC, the measure of angle A is equal to the sum of the measures

1.	In ∆ABC, the measure of angle A is equal to the sum of the measures of ∠ B and ∠ C. Also the ratio of measures of ∠ B and ∠C is 4 : 5. Then find the measures of angles of the triangle.
Answer» In $∆$ ABC, the measure of angle A is equal to the sum of the measures of $∠$ B and $∠$ C. Also the ratio of measures of $∠$ B and $∠$ C is 4 : 5. Then find the measures of angles of the triangle.