The Sahabi (companion of the Prophet Muhammad) known as "Dunnorain" is Uthman ibn Affan. He earned this nickname, which means "the possessor of two lights," because he was married to two of the Prophet's daughters, Ruqayyah and later Umm Kulthum. Uthman is also recognized for his significant contributions to early Islam, including his role in compiling the Quran.
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Numbers whose product is one is called multiplicative inverses.
That angle was called 'revolution'.
They are called SIMILAR.
Supplementary angles are 2 angles whose measures = 180o.
an acute angle