Question

a greeting card has an area 90 cm square . between what two whole numbers is the length of its side?​

Answer 1

Answer:

9.48

Step-by-step explanation:

area=length²

length=√90=9.48cm

Answer 2

The side of greeting card lies between 9 and 10 whole numbers.

Step-by-step explanation:

Given,

The area of greeting card = 90 $cm^2$

To find, the two whole numbers lies between the length of its side = ?

Let the side of greeting card = a cm

We know that,

The area of square = $a^{2}$

⇒ $a^{2}$ = 90

⇒ $a^{2}$ = 9 × 10

⇒ $a^{2}$ = 9 × 10

⇒ $a^{2}$ = $3^2 \times \sqrt{10}^2 =(3\sqrt{10})^2$

⇒ a = $3\sqrt{10}$ cm

⇒ a = 3 × 3.162 cm

⇒ a = 9.486 cm

The length of the side of greeting card = 9.486 cm

Thus, the side of greeting card lies between 9 and 10 whole numbers.