Question

Choose the correct answer :
If length of side of a square is 1.2 m, then area
of square with correct number of significant figures
is
(1)1.44 m2
(3) 1.5 m2
(2) 1.4 m2
(4) 1.2 m2​

Answer 1

Answer:

$\large{Area..of..the..square=sideXside}$

$\large{area=(1.2X1.2)m}$

$\large{area=1.44msq}$

The individual values have 2 significant figures so we have to round off the result into 2 significant figures

which is

$\</strong><strong>b</strong><strong>l</strong><strong>u</strong><strong>e</strong><strong>{</strong><strong>area</strong><strong>=</strong><strong>1</strong><strong>.</strong><strong>4</strong><strong>m</strong><strong>s</strong><strong>q</strong><strong>}$

Answer 2

The area of the square with the correct number of significant figures is 1.44 m² ( option-A).

Given: the length of the side of the square, s = 1.2m

To Find: the area of the square, A.

Solution:

To calculate A, the formula used:

• A square has four sides, and all these sides are of equal length.

• Area of square = (side of the square)²
• A =  s²

Applying the above formula:

A = s²

As the length of the side of square is 1.2 m

Area  = ( 1.2)²

    A  = 1.2 x 1.2

         = 12 x 12 / 100

         = 144 / 100

         = 1.44

      A = 1.44 m²

 Area = 1.44 m²

Hence, the area of the square with the correct number of significant figures is 1.44 m².