Rectangle Area | MCQs

Explanation

Letthe length of rectangle as x and width as y.

y = 2x Area = xy = 2*square of x

Length increased by 30. I presume it is % increase. New X = 1.3x

Width increased by 20%. New Y= 1.2 y = 1.2*2x = 2.4x

Area of the new rectangle = XY = 1.3x * 2.4x = 3.12 * square of x

New rectangle/ old rectangle = 3.12/2.0 = 1.56

New rectangle is 56% bigger than the original rectangle in terms of area.

Explanation

The area of a rectangle is calculated by multiplying the length by the width:

Area=Length×Width

=7cm×2cm

=14 cm² 

Explanation

The old length and width are L and W.

The new length and width are (1.1)L and (1.1)W.

The old area is A = LW.

The new area is A = (1.1)L*(1.1)W = (1.21)LW

or an increase of 21%