ise ques ma hamna ek baar cos aur ek bar sin kyu liya ha
Hello Ayush
Sin se humari height aaegi
cos se humara base.
Isiliye aisa kiya
Video check kariye https://www.teachoo.com/1854/547/Ex-12.2--5---In-a-circle-of-radius-21-cm--an-arc-subtends-60/category/Ex-12.2/