Now, supplementary
angles sum up to 180°.
so hmmm say one has a measure of a°, and her sibling is 5 times larger, or 5 times that much, or 5a°, we know that both will sum up to 180°, thus

so, the smaller is that much, and her sibling is 5a, and you know how much that is, unless you mean
angels, and hmmmm both have wings and feathers and are wearing a gown, but doubt that's the case.