Question

if two adjacent angles of a parellelogram pqrs are (10y-9)and(8y+45)find all four angles of parallelogram

Answer 1

Let angles of a Parallelogram be A, B, C, D
Than angle A=C=(10y-9)
" " B=D=(8y+45)
A +B+C+D=180
2(10y-9)+2(8y+45)=180

Answer 2

Sum of adjecent angle of a parallelogram=180.
And opposite angles of parallelogram are equal...