Question

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Answer 1

Answer:

= 28 cm

Step-by-step explanation:

In ΔQRT,

Let the third angle be x°

⇒ sum of all angles in a triangle = 180°

60° + 60° + x° = 180°

120° + x° = 180°

x° = 180° - 120°

x = 60°

→ All the three angles are equal i.e., 60°

Hence,it is equilateral triangle.

→ In equilateral triangle, all sides are equal.

QR = 7 cm

⇒ Side of square = 7 cm

→ Perimeter of square = 4(side) cm

                                     = 4(7) cm

                                     = 28 cm

 

Answer 2

In a triangle QTR sum of angles is equal to 180°

60°+60°+x=180

x=60°

All angles are equal and sides also equalHence it is a equilateral triangle..

Therefore QR=7cm

In A square PQRS

Perimeter is equal to 4a

4(7)=28cm

Therefore Perimeter of square is 28cm