1.

The length of a rectangle is twice that of its breadth. If its perimeter is 780 cm, calculate its area.1). 16900 cm22). 36800 cm23). 67600 cm24). 33800 cm2

Answer»

LET the BREADTH be ‘b’ and LENGTH be ‘l’, ACCORDING to question

Length = 2 × breadth ⇒ l = 2b

Perimeter of a rectangle = 2 (length + breadth) = 2(2b + b) = 2 × 3b = 6b

Perimeter of the given rectangle = 780 cm

⇒ 6b = 780 cm

⇒ b = 130 cm

⇒ l = 2 × 130 = 260 cm

We know that area of Rectangle = Length × Breadth

⇒ Area = 260 × 130 = 33800 cm2


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