If one angle of a parallelogram is 60 degrees, find the number of degrees in the remaining 3 angles ?

If one angle of a parallelogram is 60 degrees, find the number of degrees in the remaining 3 angles ? Correct Answer 60,120,120,

সামান্তরিকের পরস্পর বিপরীত কোনগুলো সমান ও চার কোনের সমষ্টি 360 ডিগ্রি।  সুতারাং একটি কোন 60 ডিগ্রি হলে তার বিপরীত কোন ও 60 ডিগ্রি হবে। যেহেতু সামান্তরিকের চার কোণের সমষ্টি 360ডিগ্রি । সুতারাং বাকি দুই কোণের সমষ্টি (360 - 2×60) = 240 ডিগ্রি। অতএব বাকি দুই কোণের প্রত্যেকটির মান হবে=(240/2=120 ‍ডিগ্রি)।
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