Answer :


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


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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