Answer:
from the pararellelogram has 4 angles is 180° and each 2 angles of this is equal so the ratio is 3:7 it will be 3x and 7x.
from each 2 angles is equal it will be 3x+7x =180/2 so 10x=90 ; x=9
Substitute x=9 in 3x and 7x ; the angles is 27 and 63