একটি সমদ্বিবাহু ত্রিভুজের ভূমি সংলগ্ন একটি কোণের পরিমাণ 55০ হলে শীর্ষ কোণের পরিমাণ কত?
A. 125০
B. 70০
C. 145০
D. 110০
সঠিক উত্তরঃ
B.
70০
Explanation:
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