માં  સેમી અને BC = 15 સેમીહવે, પાઈથાગોરસના પ્રમેય મુજબ
હવે, ત્રિકોણનું ક્ષેત્રફળ =  કાટખૂણો બનાવતી બે બાજુઓનો ગુણાકાર નું ક્ષેત્રફળ 
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