Answer :

Given:


Square BCDE and an equilateral triangle ABC have a common side BC


Side of triangle is cm


Formula Used\Theory:


All sides of square are equal


All sides of equilateral triangle are equal


If side of triangle is cm


Then;


AB = BC = CA = cm


In square BCDE


If BC = cm BC is common in both triangle and square


As all sides of square are equal


BC = CD = DE = EB = cm


All sides of equilateral triangle and square are equal


By joining triangle and square as in figure above


It forms a pentagon ABDEC


With sides AB = BD = DE = EC = CA = cm


Perimeter of ABDEC = AB + BD + DE + EC + CA


=


= 5 × cm


= cm


Conclusion: Perimeter of above figure is cm


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