Question 45
Two adjacent angles of a parallelogram are in the ratio 1 : 5. Then, all the angles of the parallelogram are
a) 30∘,150∘,30∘,150∘
b) 85∘,95∘,85∘,95∘
c) 45∘,135∘,45∘,135∘
d) 30∘,180∘,30∘,180∘
Open in App
Solution
Let the adjacent angles of a parallelogram be x and 5x, respectively.
Then, x+5x=180∘ [∵ adjacent angles of a parallelogram are supplementary] ⇒6x=180∘ ⇒x=30∘ ∴ The adjacent anlges are 30∘ and 150∘.
Hence, the angles are 30∘,150∘,30∘,150∘ . [∵ opposite angles are equal]