Q. 4

Length and breadt A. Perimeter remains same but area changes.

B. Area remains the same but perimeter changes.

C. Both area and perimeter are changing.

D. Both area and perimeter remain the same.

Answer :

Perimeter of the rectangle = 2× (l + b)


Area of the rectangle = l × b


After looking at the formula it can be interpreted as that the area depend upon the length and breadth of the rectangle.


Perimeter of old rectangle = 2 × (l + b)


= 2 × (20 + 10)


= 60 cm


Perimeter of new figure = 20 + 10 + 15 + 2 + 5 + 8


= 60 cm.


So perimeter remains same.


Area will change because the new figure’s area = Area of old rectangle – Area of smaller rectangle


So correct answer is A.

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