Question

I'm not sure how to solve this

Answer 1

we know that sum of interior angles of a triangle is 180.

we have given three angles as A,B and C .

`A=x-2,B=4x+1,C=4x+1`.

we need to find x and then plug the values of x in A,B and C.
`x-2+4x+1+4x+1=180.`

`9x=180,x=20`..

`A=20-2=18,B=4(20)+1=81,C=4(20)+1=81.`